Charlie: Haven't used a guillitine (sp) head, but from what I've read, they don't shoot well through blind netting. And, of course, if you leave a slit open, it shows up as black to the critters. Turkeys aren't as spooked by that as are deer, particularly if you're wearing black, but they might be able to catch movement inside the blind unless you're well camouflaged. Re bow length, my hunting partner shoots a 64-inch recurve out of a recurve model DB. No problem with vertical room. Do have to watch the side walls depending on how much you cant though. If you're not already aware of this tip, it's a good idea to put something that feels different on the top center hub, a piece of tape, etc. This makes it much easier to set up in the dark.