Edit: crap, I took the regular link instead of the thumbnail links. For the sake of all 56k-ers, I'll remove the images and just leave the urls.

Well, I /devmapped it to see how much you can put up top. Here are some pictures: (sorry if the brightness is odd, for some reason Trem defaults to the regular brightness for its screenshots, so you can't see crap. Had to up the brightness in Gimp)
http://img165.imageshack.us/img165/7196/shot0000kr9.jpgAs you can see, there isn't even space for a defcomp, so you're restricted to turrets. There's just barely room for an armoury, medistation, telenode and reactor, with just enough space to line the rest of the ledge with turrets.
http://img258.imageshack.us/img258/1378/shot0001uh4.jpgHowever, the reactor and armoury are very snipeable, so you need either an amazing team (in which case your base won't see any action anyway, why bother with the turrets lol), or turrets on the ground.
http://img158.imageshack.us/img158/5853/shot0002ag4.jpghttp://img257.imageshack.us/img257/3563/shot0003fa1.jpgA better layout: 3 turrets on the top, and 3 at each door. Note that on a >100bp server, this base would be much more effective.
http://img159.imageshack.us/img159/4055/shot0004rh2.jpgHere's a completely unrelated base I made after the "ledge" base, which I aptly name the "...wtf?" base. Things to note are:
- The draw glitch of the teslas between the reactor and armoury. They're really on the platform, but seem to be below. This can be done with anything that can fit on the platform, which is basically repeaters teslas and turrets.
- Again, there's no space for the DComp. I'm trying to find a better spot for it.
http://img66.imageshack.us/img66/6908/shot0005le4.jpgA risky alternative for the DComp would be to hide it in the most deserted and out-of-the-way place on the map, which usually ends up being the human base if they moved. Of course, any sane alien would notice the lack of a DComp at your base and would find and destroy it. One thing that just came to mind now would be to place it on the "ledge" base, it'd be interesting to see if it could be sniped from there.
http://img436.imageshack.us/img436/4996/shot0006pr0.jpgHere's the base, shown using up the extra BP that was used to defend the DComp.
Yes, this would be a retarded base on a 100bp server. Even if you got it up, which believe me, takes forever, one snipe of the DC and you're gone. (an all-turret base isn't an option because they can be bitten from below, and most of the defenses are placed on ledges) However, on a 150 or 200 bp server like Killaz, you'd have enough bp to guard both entrances to the entire outdoor area. You would only need 3 teslas or so to guard your "wtf platform", leaving all your other BP to make large defenses on each door. 66 bp is required for the necessities (armoury, medistation, 3 teslas, telenode, defcomp), 76 if you put in a new telenode somewhere outdoors, 86 if you put an armoury beside that telenode so that you can get a jetpack to get to the main base. On a 200 bp server that leaves 114 bp (btw thanks to the author of the bp calculator for all this

) for turrets and teslas. That'd be 4 turrets and 2 teslas per door, or just 7 turrets per door. Even more defense if you neglect the extra telenode and armoury, making that base better for small games.
Hahah, I'm really looking forward to a game where I can try that base out. It just looks so awesome.