I dont think its worth it for 3000 dollars. I spent about that building my own and it is more discrete and uses better components. It will take at least 15 hours of your time though.
Your cab looks pretty nice, but for the time and experience it would take to do such a thing (not to mention the space, which is one of the main reasons people buy pre-made cabs. I wonder what my neighbors would think if I was running a plasma cutter in my 2 bedroom apartment!), I think I'd just rather spend the extra $1,500 to get a BC Bloombox. It comes with a full year of tech support and ALL supplies for your first crop (lights, ballasts, pumps, rockwool, nutes, etc.). Not to mention this is their 5th or 6th generation and they've done a ton of R&D, as well as studied the problems and suggestions their (thousands?) customers call in with, which has enabled them to rapidly improve on their design with each generation.
I also don't have any friends that are nuclear engineer's, so it'd be pretty difficult for me to come across a heat gun used to look at reactors so that I can test the heat build-up of my cab.
Was your cab $3k before all of the supplies you need to grow a crop?
Not trying to knock you, I'd love to build my own just for the experience, but for the quality of cab I'm looking for it's just not feasible and would cost me way more in time and money than I care to spend right now.