It's not officially a thing yet, but you CAN order a 7S body, and ask for it to be routed like a rear rout Strat body. The contoured heel isn't included in that case, so you WILL have to pay for that, and I don't know for sure what the upcharge is going to be, but it can be done. I would suggest just emailing in to Warmoth (sales@warmoth.com), and they should be able to get you a dollar amount.
I know I've seen a few more go through over the years since I built that one. I've seen at least one go out with P90s in it.
Hope that helps!