Watt also had to modify his EB-3 with new pickups and new locations. Left a big gaping hole in the front of it. Sounds pretty good, but looks like a mess.
I have a problem with weight, too. 8.5 lbs. is my absolute limit but I'm trying to have my main basses no more than 7 lbs. Bums me out because I love Jazzes but I can't play them anymore. I bought a Jay Turser Beatle bass and I really love it for certain things, and it most certainly qualifies as light, but I have to have a Fender. So I've got a pieces parts P in the shop getting the wood routed out under the pickguard and a hole for a J pickup, and I just bought a Fender Precision Lyte that plays great and has crap pickups, so I'm replacing them.
It's getting bad for me. I used to love a good heavy bass because they felt solid. And I used a little tiny Ernie Ball seatbelt strap. But over the last 3 or 4 years, I've had real difficulties with basses and straps. I've spent about $250 on straps. Tried the Comfort Strapp, a 4" Slapstrap, a 4 1/2" padded Levy's strap, and an Italia 5" leather strap. None of them turn a heavy bass into a light bass. They help, but I still get sore with a heavy bass. The problem is the straps themselves are heavy. I use the Levy's because it works the best for me, but what I really want is for Planet Waves to make one of those Bass Straps in a 5" model. It's a 3" strap with a padding inside a tube of seatbelt material, but if it was 5", it would be perfect.