as long as you don't need a shutter ..
lenses harvested off of folding cameras
and old box cameras sometimes have shutters attached,
and are cheap !
have fun :)
Oh, yeah, shutter. Duh!
Ok, starting lens with a shutter. So where do you look? Harvest off something old and used? That could work.
You can find FPKs at camera shows and on eBay. If you search for them at camera shows, you'll have to open a lot of them (to see what the lens and shutter are) to find a good lens. You'll see a lot of B&L Rapid Rectilinears with horrible balsam in EKCo Ball Bearing Shutters.
Plan/budget for shutter overhaul.
"looks pretty good there--does it slide out the front? what's inside "the door" on the top?"
the back slides in and out to focus. the door on top opens to access the focusing screen and where the plate/film holder goes. I made this one to take a wet plate holder as well as a film holder. it works pretty good and looks great if your into the old style.
no movements though.
If you stick with black & white, shutters are more of a luxury than a necessity.
Learn how to use Ansel's hat or Jim Galli's high speed dark slides:
And then there's the old standby: Packard's...
Learn how to develop by inspection to avoid shutter speed anxiety.
My favourite DIY camera site: http://www.raymentkirbycameras.co.uk/ Take a look through the Workshop pages.