Need Some Input Re: Custom Orchidarium

[DasEmpress]

My DH has drawn up the plans in AutoCad, and we're just trying to decide on some particulars re:the top, lighting, fans, and possibly misters &/or fogger. Since we have so many experts here, I'm looking for your help!

The outer dims are 78.5"Wx36"Hx11.75"D. It will fit onto a bookcase/pseudo buffet that we already have. The doors will be in front, opening out, and the entire orchidarium will be framed in stainless steel (with a brushed or matte finish).

I guess what I'm wondering is:
1. Do the light fixtures just sit on top of the glass?
2. Should the top be drilled with a few holes for access for any fans, misters, foggers, etc.?
3. Would it behoove us to use acrylic vs. glass on top panel?
4. Any tricks to making the doors seal?
5. Anything glaring that we're missing/overlooking?

Thanks in advance!