I found this process lens - a Taylor Hobson 1920's Anastigmat lens 18" f8 shutterless lens. It's also very heavy (feels like 800grams?) and will strain all the clips of a 5x4" monorail.

Having no experience with process lenses, it's curious seeing through the glass which seems like window glass rather than modern curved lens glass. The lens has a mild magnifying effect and is very flat which makes it look like it would be suitable for flat copy work or even short-range work, possibly up to a few metres. I did a brief keyword search on this lens and it looks like this lens is designed to cover at least 10x8".

This has me wondering if it would be effort to adapt into a lensboard for use. Its movement movements would be sufficient for 5x4 architecture" and possibly portraiture, although perhaps this lens isn't going to perform too well at longer distances.

Any ideas or thoughts on the above would be appreciated. Apparently it won't be cheap to carve a sturdy holder unit to lock this in a lensboard: its barrel diameter is at least 6 cm and has a lens mount around 7cm and doesn't look like it'll fit any Copal.