Any tips or tricks here as it seems like a big tedious job..

wire wheel in a drill? I strongly recommend you wear protective gloves.

I had my p3 steel frame laser cut using nitrogen. The parts came out perfect no burrs at all.
Just painted and assembled.
So anyone who is having a p3 steel cut make they sure the use nitrogen, it has a major advantage in getting clean cut parts.

I had two burrs on my P3steel frame from Orballo Printing and used a Dremel with sanding disk to remove them.