The neatest stands I have seen for display models is where a hole is drilled vertically down throught the keel. A bolt is then inserted in the hole. A small brass sleeve only about 5-6mm long is placed over the bolt, and then the whole thing is bolted down to a base board. Bolts are were are spaced at about 150-200mm centres. So number of bolts will vary according to hull length.
I've used this mthod... next time I'm going with a wooden stand as the holes let the water in.

Nah, seriously.. it seems a question of glass or 'plastic' and if glass, to go toughened or not. What about if you have a big 6 or 7 ft boat that's 2 ft high. Allowing for a few inches to breathe, that's gonna be one big sheet of thin glass. What do those guys use?
Acrylic: scratches easy? How so? Would polishing it with 'Pledge' or the 'Mr Windows' on a yellow duster leave those circles at certain angles to the light?
I'm just toying with this subject myself. I don't think I'll ever 'display' it in a club setting.
What to stand a working model on in the display case? I've always thought that series of wooden blocks mimicing the shape of the hull was OK looking. Or is that 'so 80's?
I KNOW I need to make a big 'L' shaped cradle to lower mine in the water. I took it out day before yesterday and nearly followed the thing in the drink as I lowered it from a (too) high lakeside. The idea is you hold the top part of the 'l' and the boat is on the '_' bit. This will save those nasty snagging incidents on capital ships with 2 masts and interlinking rigging.
I'm planning on the 1 case: the difference between 'showing' and 'transportation' will be what front is on it. Now I'm thinking on having 2 grooves at front/rear panel. When showing, I'll hide the transportation front behind the rear panel (against the wall and out of sight) and when moving home, I'll slide it in front of the glass. For trips to the lake, I'll put the front on and take the glass out. If you follow...
The lining of the case, green velvet & hardwood with trims/mouldings?