im planning on building a boa cage or two

[Reticsrule]

i really like the plastic cages that some of the companies sell but they just seem way to expensive for me. i have had many people tell me to build a cage because its way cheaper and you get what you want. so i have a few questions.

What is the best material to make it out of?(it seems like melamine)

What size would it need to be in terms of LxWxH?(i have one male BCI and possibly getting a female)

What is the best way to heat it?(i kinda like the idea of human heating pads if theyll work because theyre nice and simple)

Should the front be glass or plexigalss?

What do you think the total cost of each cage would be?