What a great idea! I would never have considered marine carpet, but it makes great sense. I am guessing that you had some available after a marine project you completed? That based on the fact that outside of the marine World, it is pretty much unheard of.
Watch for any sights of minor skin wear/cuts on his legs, claws, and pads. But that is more commonly a problem with humans that have consumed a little to much Rum, which resulted in an on-the-face fall. Land Lover refer to that as a rug burn. Mariner refer to that as wasted Rum!
Really like the rap-around and your cutting a flat surface on top to allow for a greater balance surface.
I truly believe that God has a special place for those who go that extra distances for those with Special Needs.
Consider a Web search based on Special Needs Parrots. There is a whole community out there that would also love to see your efforts and share information regarding caring for Special Needs Parrots.
Thank-you, for Joining and Sharing! Please keep us updated!
FYI: For larger parrot owners, cut the joining edges at an inverted 45 degree angle, which will result in a very slight overlap of the surface fabric (minimum to no gaping). Freshly purchased marine carpet as with any carpet will need to off-gas in fresh air and Sunshine (outside) for a few days prior to use, especially indoors. Note: 'Outdoor Carpet' is a very different product and provides very little for a Special Needs Parrot to cling too, since it surface is very tight and smooth.