Yeah good idea with the ply wood! the lid or top of the case will have the acrylic screwed in so that should be fine. how ever i will still need to place a support in the middle of the case to also0 help keep its shape better...
This pic should show you what i mean...:
The ply wood will only improve the structural integrity of the base... the view from the top probably wont look as good with the brace i'll have to put in
This pic should show you what i mean...:
The ply wood will only improve the structural integrity of the base... the view from the top probably wont look as good with the brace i'll have to put in