I don't keep colubrids so I know absolutely nothing about their husbandry, but setting up a PVC enclosure can be as easy or difficult as you want to make it. If you approach with the right mindset, you can do it.
I've ordered several enclosures from Animal Plastics, yes there is assembly required, and find the enclosures are very easy to assemble with just a phillips screwdriver. If you can read and follow simple directions, you can assemble their enclosures.
The RHP is already installed by them, assuming you have it shipped to them directly, to make things real easy. Bob at Pro Products and Ali have an excellent working relationship to ensure quick and easy transactions.
I'm sure you'll find all the information you need here as there are a ton of good folks with experience to help. Good luck!!! (Also - check the caging section in the forum as well)