Another option is to get 2" minicell foam and cut it to make a foam floor insert like the older foam floor lynx. I replaced the foam in my older Lynx II with 2" minicell foam and it was about $120 which is more foam than you would need for a single tomcat.
This shows the old Aire manual with foam installation for Lynx I. Pretty similar to a Tomcat.
Take the approximate shape and 2 piece stacking method and adapt to your Tomcat. I would start by using your existing floor bladder as a template for the shape.
Aire Boat Owner's Manual (Page 7 of 20)
The minicell foam cuts well with a saws all with hacksaw blade.
You can actually cut the bottom shaped piece in half, the top spanning rectangular shaped piece keeps it rigid enough. That is actually how I have it done on my Lynx II.
You can buy the foam here: