You will be missing a buzz if you harvest in 3- 4 weeks - wait at least until some of the hairs turn brown before harvesting, or get a 10 buck microscope from ratshaq to view the trics. Also, need to know your grow space area (pictures would help). If you have the vertical room, I don't see any major problems with the height. You just might lose some light on the lower part of the plant. Why would you put two plants in one pot? Forget the dry/curing cabnet until you have proved that you can grow from start to finish. I am unclear if this is your first grow, if it is just dry them anywhere that is safe - then cure them in a glass jar that has a good lid. I think only you can answer the smell issue. To do this, leave the house for a couple of hours, then go straight to your grow area and take a sniff.

BHG