Thank you everyone. And I did do a bit more trimming of the lower branches. I'll post some photos in the next couple days.


About the cabinet:

Ikea PAX 100x60x201 (cm) - All white

Electrics:
Surge protected power strip
Contactor
Digital timer

Light:
250W HPS + suited ballast (kit) + adjustable height suspension things

Exhaust:
RVK100 A1 fan + suited carbon filter + ducting (kit)

(Passive) Intake:
4 x ~2" black PVC pipe L shape intakes + insect screening over the external part of the intakes

Misc:
White plastic sheeting (for the shelf, now removed because those bitches got tall fast!)
Hole saw (drill bits for intake/exhaust holes)
Chain to support the carbon filter
Various hooks/screws/etc.
Magnetic catches to keep doors closed
Heat resistant foil tape
Draught excluder door seal (closes nice and made it light proof)
2 x small fans

It was a bit of a buggeryfucker to put together but sort of fun at the same time. It took a couple of days and a couple hours each day, I'd guess. The costs have certainly added up but I am very happy with the result. I've seen some shoddy cabinets and I didn't want one of those for myself. It's an investment and worthwhile done right.

If I had it to do over again I would do slightly bigger exhaust/intake.