I finally got time to modify the TB's. It was quite simple, removed the hoses, fuel rail ++ and the two long bolts through the four separate TB's. I mounted the outer ones together with shorter bolts, cut and welded the fuel rail and then they look like this: PICTURES
Also added some pictures of the fuel pump.
Hope to connect the pump and TB to test for leaks during the weekend.
I have some trouble getting a correct RPM reading from the VR sensor on the bike, but got a few tips today so I hope it will be sorted pretty soon.