I bought one of his 6x18 cm camera for 120 roll film. It works wonderful and it's a beauty. And costs much less than the Titan cameras ...
It has a simple but ingenious internal shutter and no changing back required
It is also possible to fix a filter in front of the pinhole.
I'm contemplating on the Vietnamese cypress handmade 135 pinhole camera (focal length: 25mm, 24x68mm wide frame) price US$67 and US$10 for international shipping.
He also made a nice 4x5" wooden pinhole camera once for film holders with an internal shutter with cable release.