According to everything i've read the foam should only need to come out if it seems waterlogged. In my case it still seems quite intact and not full o water. Others with actual experience can probably chime in here.
A few of the guys have recommended using a few of them as "wet" hatches which I'm considering.
Various readings on the tank issue, but seems like the consesus is that if you coal tar epoxy the tank you can refoam. As far as holding it in place I've seem some posts with a few crossmembers running across the tank but under the floor which keep the tank down when you put the foam.
In order to be able to use this method i'm expecting to put the floor down first and then reinstall the tank. Having run my new lines and wires before putting the floor of course.
Excellent trick which I read on removing the foam was a pressure cleaner. Didn't read it till after I took my tank out but helped in removing the foam after to clean the hatch. Insane the mess it makes but works very well.
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