for my money and time I'd skip the 7-speed FW and get a 6-speed Shimano (their twist-tooth FWs are very reliable IMO) then you might only have to re- dish the rear wheel (not rocket science as far as wheel building goes) and with the tubing (pipe) that the Pug has you may be able to keep that axle with a slightly larger spacer or two and jam the now 126 OLN rear hub into the rear triangle with no permanent spreading required...maybe...