Two month old thread, but, I'll take a stab at it just because I've been thinking of a similar project.
Garmin Approach r10
599.00
Carls Place 8' x 8' x 5' DIY enclosure w/preferred screen
675.00
1" EMT for above
180.00
BenQ TH671ST projector
699.00
Perfect Reaction 4' x 5' hitting mat
235.00
2,388.00
8' x 8' might seem strange but this would occupy 1/2 of a two car garage. Ceilings are about 11' but there's some shelves above where the enclosure would sit that would limit it's max height.
Any thoughts?