Making enclosure for Red Tail Boa

[Lichjen]

My husband is looking at making our female red tail's permanent enclosure. He was thinking of making it 6'x6"x3" is this a good size? or is it too big? We are going to want her to be happy and have good space.

If this is good we are going to be buying the plexiglass soon and get started on it. I also need to know what kind of wood or plastic to use to hold everything together. (We are also going to be putting a lock on the enclosure - she has a lock/key/chain right now)

I know when we move her at first she'll be shocked (she's 9 months almost 3 feet and almost a pound) but I am also not sure how long it will take to make it