I suppose one way to do it is the empirical way, and get hold of some of the long strings and see what you have to play with.
The string break angle can be quite severe and still be OK. If you think about rear mounted strings coming out of the bridge plate on say a P-bass bridge, they probably are bent through 50°-60° without coming to any harm. That's far more that the worst break angle over the saddles!
What you really want to avoid are the strings touching the rear of the bridge itself. So that determines the maximum break angle.
So you first need to decide whether to use the kit bridge or a bass T-O-M style or whatever, as the rear of the bridge will be slightly different in each case. Then you'll need to calculate the bridge height, and from that and the break angle, where the strings will hit the body. You'll need both the rear ferrules, and smaller ones for the top (or a drilled plate) to stop the strings wearing the wood away.
One other bridge mounting alternative not yet mentioned, is to drill through the body with an 8mm drill in the centre of the bridge post holes, and fit M8 bolts from the rear that screw into the post bushings from the rear of the bass and that will certainly hold them in place. You'll just have to cut the bolts to length so that they screw in enough to hold the bushings in place whilst still allowing the posts to screw in from the top (these could also be slightly reduced in length if necessary). The bolt heads could be slightly recessed if necessary (if pan head), or you could use countersunk heads so that they lie flat at body level.
Just another idea to ponder.
Please ask any questions you want, and feel free to put your plans forwards before implementing them in case we can see any pitfalls.
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