Tricky Closet Dimensions for First Time Grower: 12' (or less) x 4' x 3-6.5' (varying)

[TheGreatBelow]

I would grow horizontally in there, utilizing the length of the closet.

So is the space not tall enough or...?

make sure to line the walls with either white poly tarp, mylar, flat white, etc.

can you cut holes for intake / exhaust?

Yep, I plan on doing that.