I had no issues with my Silkies out in the coop/run setup with the standards. Of course, my chick raising methods kinda fly in the face of convention and they are raised outside in a wire pen in the run where the Bigs can see them all the time and they can see the Bigs, learning from them how to be chickens! I use Mama Heating Pad out there, and my chicks - yes, even the Silkies - are totally integrated with the rest of the flock and off all supplemental heat by 4 weeks old. Here our "spring chick season" can still be pretty doggone cold and snowy....a few years ago we got our last snowfall in June. So yours should be fine arriving in April, and ready to go outside when the weather is nice and balmy.
I live in Northwestern Wyoming, not far from Yellowstone Park, and it gets cold and snowy here! That didn't faze my Silkies - even in the dead of winter when I went out to do chores they were always among the first to head out the open door for the wide open spaces of the yard. I have one photo of them outside when it was 9 degrees with snow on the ground. I think the key is that they weren't overly pampered - they were allowed to gradually acclimate to the shorter, colder days and long, frigid nights right alongside of the others. My coop wasn't heated or insulated. The only concession we made to the weather was to cover our run in mesh reinforced, clear greenhouse plastic. Our run is a hoop run, which made that process so easy. We made the south side plastic a separate piece so that we could roll it up or down depending on winds and weather. It was usually open to let the warm southern sun come in. The north side had a large vent area over the people door. Humidity was kept to a bare minimum - being wet is not good for chickens, but for Silkies with their funny feather texture it's critical. Sealing a coop or run up tight is the fastest way to get an excess of humidity in their setup. Ventilation is key.
I put in a lower roost in the coop for them. Some used it, some snuggled down on the floor together, and a couple of brave ones ignored what the books say about them and got up on the big roost with the standards. As you watch yours grow and change, you'll be able to tell what they prefer. Around here they were just another part of the flock. I've included some photos of them.