Is there anyway you can link me to that cage so I can have a look at it for myself?
Also be careful about plexi, it scratches easily and it looks horrible once it starts to get scratched. Also the 55gal long is 48" long which is 4 foot as well.
Just a visual, here is what a 65 gal looks like:
EDIT:
Correction, I owned this tank, it was 65 gal.