Tom, that sounds like a lot of work. I keep mine to one level. I hope you can get it done.
Yes it is certainly a lot more than I bargained for. The platform is about 72 sq ft of ½” plywood covered with ½” EPS foam and is coffee table height.
I will try to post some pix as I go, but getting it done (or largely done) by T-day will be a push.