Questions are no problem. :)
I made the entire bottom screened, BUT I built a bottom board for it to sit on with built-in slots to use sticky boards for mite checks. I can leave it ventilated on the bottom if I want, but I will probably use the bottom board most of the time. The entrance is (3) 3/4" holes , plus a small landing board made from a 1x2. The entrances sit up about 7 or so inches from the bottom of the hive. (this seems to be the preferred entrance height on my existing hive from a manually cut hole between two supers) They don't usually use the bottom entrance, for whatever reason. I haven't cut any top ventilation into it, but am still considering that, but there's a small (1/16") gap between the hive body and the inner cover on the front surface that will ventilate it, unless the bees decide to fill the gap with propolis. I think I will just put it out as is, and see what they do. Bees know what they like, not intellectually, but instinctively, and I like to let them have some choices in the matter. :-D
The inner cover is made of luan panel (I think it's 1/4") and 3/4 x 3/8 inch trim pieces and I cut two holes in it. I'm going to post some pix on the photo hosting site I use, and will link them if you want.
I also built a boardman-type feeder and cut a slot for it toward the back of the hive (to help prevent robbing). I built the outer cover out of 1/2" plywood and 1x2's, and covered the top of it and about an inch over the sides with aluminum flashing.