Honestly unless you have routers and a lot of power tools and the room, it's better to just buy a premade PVC cage. My advice is buy an Animal Plastics cage. They are built very well, offer lots of customization and add ons and Ali is awesome to deal with. Plus it will be lighter and easier to move and clean than a giant piece of furniture lined with PVC.
Another piece of advice is KISS...keep it simple stupid. Not saying you're stupid lol, its just the saying I heard while growing up and working in the automotive repair industry. It's best to keep your cages simple and easy to clean and maintain. The more complex you make something, the more chances of having problems.
For example here are a couple pics of my cages. Animal Plastics T25s 6x3x18 cages. These have an almost 7' retic, 6.5' boa and 5.5' boa.
Animal Plastics T10s on the bottom 4x2x15 cages with a dumerils and ball python and 2 T8s on top 4x2x12 cages with 2 baby boas. Also have another T8 not pictured with another baby boa.
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