Turkeys eat a lot of grass. Will that bother you with your soap run off? It could be toxic in large doses. I'm a fabric softener junkie - so we had to give up the best most beautiful pasture here just to watch grass grow. I thought about using organic soaps but I still have to use bleach and was oily rags and other weird stuff. - Just a thought.
Your 7x7 pen will get you by for a long time as they grow - but as adults you could really use more room. I mean - commercial birds stand cheek to cheek in houses - so it's up to you what you think about how much room you need. It is important to start them out and keep them in this pen for a few weeks no matter how bad you want to let them out. Then only let them out for a few hours at a time at first. So they know how to get in and out without getting lost.
If Royal Palms float your boat... Get them! Enjoy yourself!! That's what we do all this crazy stuff! I have Royal Palms and they do dress out nice but they are a little smaller in size compared to the RB and the Narragansett. But one or two pounds may not matter to you. We survive on our birds and after processing 20 of them - it added up to me! ...so I am sticking to the bigger birds. A Royal Palm hen dresses out at 6 pounds - about the size of a large chicken. They fit in the smoker back to back quite well! My Toms dressed out at about 10. They are over fed and have an inch of fat over the breast. It makes for a very moist breast!
About your roost - 4 1/2 feet is too high. Yeah - they can do it but as a Tom gets big it's going to be more dangerous for him to get up and down without risking leg injury (or neck - I had a Tom break his neck jumping down out of some rafters - so I have clipped wings ever since.). I keep my perches at thigh level. I don't want to get pecked in the eye (nah - would never happen - but I have a cartoon brain). I have been beat in the nose PLENTY of times by my birds jumping up to my perches. I think they know how to beat those wing tips on my nose. I swear this isn't a lie. Actually, you don't want them to exercise their flying or jumping ability as it make it easier for them to get over fences. Keep them low - they won't mind. They like a nest about 2 feet off the ground. I use a recycleing bin screwed to the perch and the wall. It has good sturdy sides and won't tip or crush when they stand on the edges. I screwed through a board in the bottom of the nest box to anchor it to the perch so the screws don't work their way out.
The birds in the first photo are behind a temparary fence. If that was their regular fence those mature Toms would be strutting at those folks - The guy with the camera is likely new. You can see all the birds studying the fence.
The second fence is - yep 6 or 7 feet tall and that's great if you can afford it! It would eliminate LOTS of fly overs without clipping wings and with clipped wings it should be eliminated all together. Expense is the issue on that one. I'd do it in a heart beat if I could but I have goats who like to climb at my fence too.
The last photo are (most likely) broad breasted whites. Their heavy breasts keep them from even trying (but they look like they could still). The grass on the outside of the pen is smashed down from on-lookers but the grass inside hasn't been used. These birds aren't in this pen that much or the grass would be pecked short from daily use. Perhaps they haven't figured it out yet.
I use a 4 foot woven goat wire fence. I keep the birds penned up when they are small and widen the pen with chicken wire until they are big enough "get stuck" in the fence or at least slow them down. And yes, this is idiotic - I spend a month checking for escapees a few times a day. They won't go far from the rest of the flock unless they have time to learn to wonder off. I know it can be fixed by another layer of chicken fence a foot high around the bottom. I have a few acres fenced off so I can't afford that. I just have to wrangle birds until they are too big to squeeze through the holes.
Why not get smaller holes? I got that "Red Brand" fence with the two inch holes and it fell appart in 6 months. All the welds rotted and strips fell out and chickens were everywhere. I was so thankful it was a roll of temperary fence I used to expand their yard with. Perhaps It was just a bad roll - worth making a post about. I wouldn't use chicken wire because an attempt to roost at the top would crush it. I still get the occasional fly over but they want to stay with their friends and usually walk the fence line back and forth trying to get back in. The Toms are too heavy at a year old to attempt to fly.
A lot of trial and error goes into turkeys.... but it's so worth it! The fence is the most expensive part - but it's a one time investment. The nice part about bird fence is that it doesn't have to hold pigs or goats. It doesn't take much to put it up. Fence posts are 5 bucks each and it's nice to get to spread them out some!
I use Cackle Hatchery out of Lebanon Missouri. I am pretty sure they will ship to texas but they have a minimum number of birds to purchase for warmth. I had birds delivered when it was 14 degrees out and they were fine - I have never had a dead bird in my order. There usually is loss later - I think these breeds are a little inbred from hatcheries - and most people running adds get them from hatcheries too... so expect to lose 2 if you order 5. (I do anyway - but I run a medicine free farm.)
I hope this helps you out some. I'm no expert... I started out just like you... until I ate one... and then it was all obsession after that! Just have fun with it! Your determined so it will always work out!