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Hi John,
Thank you for the compliments.
I had a look at your profile and saw a photo of your floor tipped up on edge. WOW that is a massive piece! The floor on my 22 is in three pieces instead of yours as one piece. My centre piece was so wet and heavy it took three of us to lift it out. Yours must weigh a ton! I attached a few photos of the moulded liner and also the floor sections. Notice the floors have a lapped joint similar to shiplap lumber. This allows the joint in the floor sections to be supported and sort of work together. The joint in the floor is over the large supporting area where the sprue hole is. You can see sealant where the screws go.
Honestly, I can't remember how much foam I used. I think I used most of two 1 gallon kits (each kit has 1 gal A and 1 gal B) so 4 gallons of liquid. The foam expands at a known rate - I think 8X volume. so you can calculate the volume required and divide by the expansion rate.
Good luck with you project
Warren