Hi Troy
I think the big problem is finding your tube, The tube used in Paul's camera is a Pye Photicon or possibly a Pye PES Photicon, or, in plain speak, a midget image iconoscope tube. These are like hens teeth to get hold of in the UK. The availability of Iconoscope tubes is better in the USA, still expensive and best collected!
Image Orthicon (I.O.) Tubes are much more common and several people have constructed cameras using them. See CQ-TV 89 to 91 downloadable from the BATC site,
www.batc.org.uk for an example.
Attached is a picture of a home built 3 plumbicon camera compete with home made light splitter (mirrors + filters).
Regards, Brian,
www.tvcameramuseum.org