I've seen invisions grow and it looks good. Have yet to see how he's got that thing set up though. The plexi seems like a pretty good idea if you can pull it off nicely. Have you looked into an air cooled 250w or 400w. With the remote ballasts they make cooling a cinch if you have ventilation dialed in. I cool a 400w air cooled in a 5x2x8 clos with very little problems. Fan is 150 cfm, cut one hole. Set up is nice and easy and they put off a nice footprint. Squeezed 11 fems under it. You can set em up for no smell also, just havnt yet. Catch the drift?