Thanks for the response!  That's what I did.  I started  at the lowest level and used blocks to build stairs and and the upper level.  It actually worked pretty well.  I haven't tried any games yet, just the home builder which is what interests me the most.  I'd love to export my created home as a 3D model that I could turn into my oculus home by sideloading it.  That would be a killer feature or app on it own.  I thin you could even charge for the exports.  I know I'd pay.  I did run into a a bug where my changes weren't saving without setting a new anchor point each time.  I also get the strange red lines/walls stretching up to the sky when I delete walls.  They stay there until I reset, but that's manageable.  The elevation can get screwed up until I re-enable the guardian redraw the guardian play space and disable it again.   If you do something to screw up your tracking or anchor point it's pretty much impossible to recover your positioning with  recreating your entire space.  Some manner to adjust your position and elevation when it screwed up would be useful.  Also really strange is my objects in the home builder are rotating 180 degrees around the center of the space, while the blocks and walls stay where I put them.  I've had reposition all the objects twice so far.  I'm trying to figure out if a specific set of actions is causing it.  I haven't figured it out yet.   Anyway, it's really cool stuff and 'll log these issues  in the appropriate place for bugs once I have a better handle on what's causing them so they can be recreated.