Tolex techniques and case materials

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2 somewhat related questions:

Dose anyone have a fender rhodes where the piano body uses 1 big piece of tolex to cover the piano body instead of the standard 3 piece style (1 for each side + 1 big rectangular piece to cover the front, bottom and back)
My piano has 1 big piece cut so that the only seams are at the corners, after removing it for replacement i noticed what looked to be some body filler used so i am assuming it's not original. It is wasteful but i prefer the look so i replicated it when replacing the tolex, I'm wondering if this was ever standard from the factory? It is less cost effective but I think it looks more elegant.

Another thing noticed while retolexing, the piano body appears to be made from a plywood bottom piece like expected, but the sides, front and back are made out of laminated pine board (a bunch of smaller pine planks glued together to make a wider plank). I know this isn't the case with the 1977 Rhodes I retolexed which was all plywood, does anyone know when the cutoff date could have been? It's not super nice wood or anything, but for home use it could make a good cabin themed Rhodes if sanded and stained. This is a 1973 stage 73 with the full skirted key caps.

While not particularly important, I do find these differences interesting and don't see any information on them.
Thanks.