Framing on Voltage Ramp Door?

[The Cramblersons]

Howdy, all!
We don't use our garage for toys. It is used as my wife's studio/business. And for the months when we travel and she needs additional usable shelving, I am considering anchoring some shelves to the inside of the ramp door.
Does anyone know what the framing inside the door looks like? I assume it is some combination of aluminum cross members and bonded plywood or aluminum decking but I I thought if anyone had previously had a reason to disassemble it, they might know better. Photos would be a bonus!
Thanks!

[dsol]

No idea but given that door is designed to support some pretty heavy loads I suspect it is pretty solid.

[azdryheat]

2 sheets of plywood side-by-side

[erhardd]

My previous toyhauler which also had a lippert chassis , the rear door was honeycombed material, mine failed and sagged like no other, lippert replaced it. I don’t think there is very much solid wood in there. It would be way to heavy if it was plywood.