When I'm working on a van project I don't count my time as a hard cost. That's because working on my van is therapy for me from my regular life.
I price my labor in burritos and beer to my buddies just so we can hang out. They do the same for me.
Putting the top on my van and build out the interior was a lot of therapy, burritos and beer.
I found a top in the salvage yard which required work, but put me all in, including upgrades, interior materials, etc, for far less than what you can get out of your pop top assembly.
Either way you go, turn key or DIY, you are going to love the storage and space created by a 24" high top. At 6 feet tall I can wear a ball cap inside my van and never scrape my head. Lady Shadetree and I think it may be the best van we've ever had, and the best modification we've done to any of them.
Just be prepared to say goodbye to drive thru's and parking garages. The other day in a parking lot I had to find an alternate route because of a low pruned tree. On the plus side, my van is always easy to spot wherever I've left it parked.
Good luck on your project.