I ended up ordering the Rockwell from Tim Walford and I started building it a couple of days ago. I have to say I'm struggling a bit. The instructions are quite terse and you need to read them a couple of times or maybe 3 or 4. The PCB is not marked, like a standard kit. You have to deduce where to solder the parts from the pictures provided (but I have a pdf colour copy, courtesy of
http://www.learnmorsecode.com/regen/WALFORDS/index.html) and the hand written schematics. Note that the owner of the above mentioned site has also played around with the kit, something I plan to do later on.