Questions regarding HPA dmr conversion.

Neewbie gunbuilder here. (Gonna be the first time)

My first gun a LT-32 dmr has given up (its gearbox keeps locking) and I want to rebuild it to a HPA dmr. A bit of a pet project for a sleeper build.

I already have a mancraft v2 PDik I can buy new at half retail but I am wondering what else one needs to buy. I’m mainly looking for advice for internals.

So far I have thought about buying the following based on some youtube vids etc.
- Maple leaf bucking (70)
- Maple leaf concave omega nub
- Max model cnc hopup for m4
- A new barrel? No idea what to choose for this.

Any tips and tricks are welcome.