Dustdevil-Iíd have to agree about the seams. I hope you take this constructively and donít feel like weíre raining on your progress or discourages you in any way from posting here or otherwise...really! Just trying to be helpful, and save you lots of potential aggravation later on.
Thereís lots of ways to go about staging floors, and lots of threads found on the forum, I just did my flooring and used Vantred from Bedrug, comes precut and was able to use it as a template for the ply.
Iím in the final stages of my (re)build found here for reference if youíre interested......
My big fat interior (re)build
The other thing Iíd point to is where your seams are landing. Itís best to try to get them pushed to a side or under where your cabs are going to go, away from the middle of the floor or high traffic area, as seams are the weak point and can sometimes show through. And one more thing, sorry...I considered using rigid foam for my floor as well, but decided not to for several reasons. The big one being the squeak factor with rigid foam sandwiched between wood and metal. It may be fine once glued and screwed but I didnít want to take the chance after everything was installed, would have driven me nuts. Everything begins by giving it a solid foundation.....no wonder Iím so screwed up!
Best of luck with the buildout.
Sorry to hi-jack Dilly, but this pertains to you too, check out my thread for insulation.