Grow room setup help :)

I have a few questions to ask about my future growroom. Q's are below

1. I'm looking to grow in the growlab 60 which is 2x2x5'3. The problem i have is where i could find a cabinet(cheap) to put it in that also has a lock or just build one.
2. What are some scrog screens i could use for the tent and how many regular plants could i place in the tent.

My advice, build your own cab, this way you can have it the exact dimensions you need and add to it all the features you want (including hidden locking mechanisms). Your other option would be to get a something like and end table, a cabinet or a set of drawers and modify it to fit your needs.
I have a 1x1x2 office drawer cabinet that I'm in the process of modifying to a stealthy grow cab at the moment.

As for how many plants you can fit there, well you can fit 1 plant per square foot, but then again it all depends on how long you want to veg them.

Scrog screens: get some 2x4, build them into a frame and attach some chicken wire to it. 1sq inch eyes.