As far as I know from reading stuff online and reading books:
Length can be anywhere from 3 feet to 6 feet, although most are generally 4-5 feet
I honestly don't know about the weight... I only have one corn snake and she's a baby, and don't recall reading anything about adult weights... Seems like I've commonly heard of them being in the 700-800 gram range, but I guess it really depends on the length. I honestly have no idea. I'm sure the information is out there, but I don't remember it if I've seen it haha
I'm not really sure what you mean by strength... If you have the vines secured or tied/supported in some fashion, I don't really see that the corn snakes would pull them down. Some corns like climbing, others don't. Mine, in particular, never climbs even though I've provided her with a branch and vines haha
As for visual spectrum, as far as I know, if you want to have a light on at night for viewing them, you can use a red or purple (I think) bulb and it won't interrupt their day/night cycle because they can't see red light
Please someone correct me if I'm wrong on any of that!

I've been doing research but still am very very new to all of this as I've only had my baby just under 2 months now haha
Now, something you didn't ask, but I think should be mentioned. It isn't recommended to house multiple corn snakes together because of several different reasons, some of which are 1. possible cannibalism, 2. the female becoming gravid unplanned and when she is too young if there are opposite sexes living together, 3. easier spread of disease/illness if one snake is sick, 4. if one snake regurges its food, you won't know which one has the problem, and 5. snakes are solitary animals and generally speaking, having another snake around can stress them out. That may be something for you to consider when you are building a cage for them. Maybe you might want to put a divider down the middle so you only have to build one structure, but they will still be separated. I'm not sure if they would still be stressed out by seeing/smelling each other or not.
I hope this helps you out

I'd suggest doing some research on them so that you can better know what to expect from them as they grow. They can live around 20 years so be ready for a long haul
