At this point I'm debating between buying a clone or buying a kit.
IMHO, the 5e3 is such a simple amp, you'd be better off sourcing the parts yourself instead of buying a kit, it'd be cheaper and you can choose exactly the types of caps, resistors, transformers you want. Plenty of folks make wood cabs for 5e3s if you don't want to build one or have the skills/Tools for the job.
I understand, however, I can help you out making a bill of material if you want. I based the one I finished a few months ago from weber's layouts. I won't have all the parts number for mouser or other U.S. stores but I can definitely help anyways.
Just PM me if you're interested. Otherwise there are plenty of very nice kits out there, have fun!