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Kamie,

One thought on how to pour the foam with the least waste is to cover a large piece of cardboard in wax paper, or tape, and tape the cardboard to the floor over the cutout section. Maybe do a third at a time with bow up. Or use some form of flexible plastic sheets which may give a much better approximation of the original floor shape. It probably doesn't matter if the foam sticks to it or not.

I have done some foaming recently and adding foam to previously added foam works fine. You can keep adding it until the space has filled. Pouring small quantities until you get familiar with it seems key.

Also, if you have an electric sander with a vac attachment it works great for sanding the foam.

There is a 1960s 17 hull redone by metan with a few pics of foam under floor replacement. All the work they used to have on their site is still on youtube. They have a channel. Note they use a metal snow shovel to remove foam.

https://www.youtube.com/watch?v=ERbPJ_xxH6o&list=PLlDXFFy4XX7Xe0MOJxgTEyNsmw9irKRME

I am not sure if we can refer people to businesses on here but I found a great price on foam at a place called mertons fiberglass. Their prices on everything are very good.

http://www.mertons.com/Floatation/index.html

Personally I find attempting things like this myself rewarding, albeit requiring a lot of patience. Good luck.