plate camera

A plate camera was won on ebay just now. It is a Vageeswari 12 x 15 inch. It may be seen for a while here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=300319213600
That price is easily twice what I've been paying for smaller ones, but then, large ones are rare, if for plate, and not for film, but glass. That is my focus, glass plate. So, I had to have it. The missing knob will come off a rough 10x12 that needs help that I got just in case.

That 12x15 size that will require larger plate spreading equipment. Are larger than normal sizes available?