Are you planning to move the Converticoop? I ask because I built it, and it is pretty heavy, though it is easily moved by two adults, but if you have any muscle weaknesses or such, you will find it hard, if not impossible, to move.
I like the Converticoop, and I would recommend it for 3 birds, but not as a movable tractor, and honestly, depending on your disabilities, I wouldn't recommend it at all. If you do build it, I would definitely cut the long sides in half, as they are heavy and cumbersome to get in place.
I would also say not to make the sides out of treated wood, as mine have warped terribly in the sun and fall off. We had to put a row of nails under them to catch them when they fall. I can't swear it wouldn't be a problem with untreated pine, but I KNOW it's a problem with treated wood.
You can get a miter saw for under $100 at Lowe's or Home Depot, and usually you can get them to cut the plywood for you, which is about all you need a table saw for.
If you were able to purchase a miter saw and a sabre/jig saw, you can build it completely yourself, and just cut the plywood with the jigsaw. You will need a jigsaw to cut the plywood cut-outs for the legs, even if you have the lumber store cut the big sheet for you.
I really like my Converticoop, it looks really nice. I do have some complaints about the person who wrote the plans. If you make it, DO NOT follow the cut list, cut the wood as you go, because the measurements he gives in the cut list are NOT the same as you will find in the steps as you begin putting it together. I emailed him some questions over a month ago, and he hasn't bothered to respond, which I find to be poor customer service.
I was able to build mine for well under the $175. Definitely use screws and not nails to put it together.
