I am 98% finished with my spraybooth that I (finally) tackled during the holidays...I've had the materials collected for about a year but was just a little too intimidated to start. I shouldn't have worried; it's GREAT and works fantastically. I, too, looked for years at spraybooth designs and having taken two Steven Hill workshops over the last 12 years I was/am sold on the idea of spraying. I cobbled together a few low tech boxes w/filters and fans over the years but they were a temporary solution at best. If I couldn't come up with a dependable, functional spraybooth I knew I wouldn't get the repeatable results and high quality glazing that I was after. I became convinced that a waterfall spraybooth was the design that would fit my requirements the best because it is the most efficient design at containing the overspray and would help me avoid drilling a hole in my garage wall (brick). It uses a shop vac to create negative pressure in the booth instead of a fan and is on casters (like everything else in my "garagio").
I ran across Joe Dillett's waterfall spraybooth videos about 14 months ago on YouTube and joined Pottery Basics in Yahoo Groups so I could download the detailed construction drawing that goes along with the three videos. (
is the first one... the other two are linked from it.) Joe is very personable and corresponded with me by email when I had a few questions; he is a very skilled woodworker so he has great fabrication skills but you can have just average "wood butcher" skills (like me) and still get the necessary results. My cuts just aren't as beautiful as his... I liked his use of the plastic tank in lieu of a shower stall because I couldn't find a cheap enough shower stall (new OR used) and liked the idea that the tank lets you have doors that close it up when not in use.
I won't go into the details of the booth; they're all there on the videos. I don't know if the materials are within your budget, but here are the major items of expense:
160 gallon polypropylene water tank (available locally to me so I picked it up) ... $170 and it is 31" dia x about 5 ft high.
Six brass hinges and a hasp closure (Home Depot, about $40 total)
Aluminum reflector work light (Home Depot, $20)
25" x 26" piece of 1/4" Plexiglass ($35.50, cut for me by my local glass and mirror company) ... picked this up this afternoon
Assorted pieces of 1-1/2" and 1/2" PVC pipe and fittings ( Home Depot, probably $40 worth because I bought pre-cut 24" pieces of pipe instead of cutting my own from long lengths)
Two movers dollies from Harbor Freight (8.99 each when I caught them on sale) I connected these together side by side with long pieces of 1x2 wood screwed into them... the booth sits on them and can be rolled around.
Large fountain pump (692 GPH with 11' max lift) from Harbor Freight ($49.99 online but $37.50 after my 25% off New Year's Day coupon at my local HF store)
Misc copper and plastic tubing clamps (less than $5), spare bucket for the pump to sit in, $8 of plastic sheet for the work light to sit on, etc.
Shop vac and compressor (I already had them)... and $14.95 noise-cancelling ear muffs from Harbor Freight: they use AA batteries and cancel out sounds above 90 dB, allowing me to stop worrying about the noise the compressor plus shop vac make --- since I don't have the option to put the compressor in another room.
Good luck in your search; I know it's hard to get what you want within a reasonable budget but you will find it if you keep looking.