A few concerns I have..

[Eric Alan]

1) Overall Demeanor/response from my snakes. I'm worried that putting them in the v-18 tubs will change them. Right now all of my snakes are puppy dogs, but they kind of see me coming right now in their tubs and have a way of sensing me I guess. But I feel like that may change once I start sliding them out of the darkness so to speak since the rack is only front sliding and closed off on three sides. I just don't want to scare them half to death and make them start becoming defensive. My animals are definitely a project that I have in the works, but first and foremost they are my pets and I love holding them and building a relationship with them (not like a bathing together, drinking from my mouth kind of relationship, but you know what I mean).. am I overly worried? Just trippin? Lol

Yep. Just trippin'. If that were the case, then every snake kept in a rack would have that same tendency, which is of course not true. I mean, don't go blindly reaching into tubs without making sure they're not in strike mode, but I don't recommend anyone doing that no matter what type of enclosure they're kept in.

2) Light cycle. I know BPs don't really REQUIRE a light cycle but I guess as a caring human, I hate to have them always in the dark. Right now I just use light from the windows and a normal incandescent bulb in the ceiling fan to provide them with a light cycle in the snake room, but once they're in the rack, will the little bit of light coming through the front of their tubs be sufficient to let them know when it's daytime?

The light through the window will be plenty. As reclusive animals which "in the wild" which spend their time in a rodent burrow/termite mound, they get about as much of a light cycle as you'd expect in a hole in the ground. The light from the front is plenty.