better late than never :)
i fitted an F logo bigsby (essentially a B5) to my 70's tele a few months ago, OMG did it cause some problems :(
i bought it from angela music in the US off egay as it was much cheaper than this country
I dulled it all up to it matched the rest of the guitar by using a bit of 1200 grit emery paper, bit of oil and a wire brass brush to give it that bronzeeee tint :)
managed to snap one of the bridge screws inside the body

cos the drills they tell you to use are a smidge too small in my eyes, the wood in the body is hard as hell and the screws are made of god knows what. I ended up knocking a small hollow rivet into the hole and carefully drilling out the screw. In the end i decided to re-use the original bridge plate screws that were a tad smaller.
managed to drill one of the bridge thimbles too big, they say to use a 9mm drill bit, the thimbles are 9mm in diamater, apparantly the instructions assume you are a machine and can drill a perfectly straight hole and have absolutly no wobble or play on the drill at all. for the second hole i used a smaller drill bit and kept drilling it out till the thimble fit in but was a fairly tight fit. thankfully i managed to recover these few minor problems without ruining my guitar!
bottom line is, they're a bitch to keep in tune and a bitch to fit but damn do they look sexeh! :D and i can honestly say i'd gladly do it all over again :)
check out this webby:
http://www.xs4all.nl/~msengers/htm/gallery.htmloads of pics of bigsby tele's and destruction manuals from different years to download so you can see what's actually required.
I'll post some pics of mine when i get home too :)