I would like either a 45 based tube amp or a 300B tube amp. I'm leaning toward the 300B because it opens up the range of speakers that can be successfully used - but I'd prefer the 45.

My room is 15x14, and opens up into a 10x15 room. I'd like it floorstanding, and it can't be too large (a 24" wide speaker is too big - you know WAF!). I was looking at the 4pi speaker with JBL motors - it seems to be of relatively reasonable size. Would this be a good choice? Are the folded horns easy to construct out of plywood?

Thanks! These look like fun speakers to build...