Hi, Yes I have build a 5E3 from Karel Mars.
His kit is the best in my opinion. Check out my blog where I build a tweed deluxe from scratch. (Still need to do the final blog post as the amp is complete and sounding oh so sweet). I am very new at building amps and Karel was a great help to me for advise on how to do things.
http://beltandband.blogspot.com/2013/07/tweed-deluxe-kit-has-arrived.html
http://beltandband.blogspot.com/2013/08/tweed-deluxe-amplifier-covering-with.html
http://beltandband.blogspot.com/2013/07/tweed-deluxe-baffle-board-grill-covering.html
http://beltandband.blogspot.com/2013/06/tweed-deluxe-cabinet-construction.html
? Jacques