Yeah I was actually planning to top at 4th node and lst. But I wasn't sure if that would keep plant short enough. Since I'll only have around 1.5 feet or so of grow height.I've got the answer to your problem right here. Keep your current tent, use LST to keep the plant short. Buy a fan and filter with the money you have now.
Read this diary for a good way to LST by @Savage Garden - https://www.autoflower.org/threads/...&share_tid=64953&share_fid=25553&share_type=t
Welcome to The Savage Garden
Sent from a rock in the sea!
FYI that appears to be a dead link sadly.