Just got my kit today. Thank you.
I've read the horror stories from fender3x and Roger79. The bridge bushing holes miss the body center block. The threaded studs suggested by Simon Barden, in this case, don't look doable. I've decided to cut to the chase and use the thru-the-body string mounting. How far back from the bridge should the string ferrules be located? They look like 5/8" on the bass built by Roger79. Too close and the sharp bends in the strings looks fragile. Too far away and I might run into string length trouble.

Not my first build. Bought a 335 from another dealer by mistake but I don't play guitar. Decided to build it build it anyway. Nice kit. It was a breeze and a guitar playing friend is agog over it.