Really appreciate the insight! Now that you mention it, adding some extra room is something I'll need to do. I hadn't even thought about not having enough head room to work and two feet is probably cutting it close even with what I've got planned now, so I'll definitely need to add a little height. Seems like it would make sense just to make it a foot taller and wider to be safe. That might necessitate some cross-member support across the top, but that shouldn't be too big of a problem.
As for allowing fresh air in, my thought was that I'd have the plexiglass slid up enough for