For all those who want custom string spacing on a vintage style bridge and bass, it can be done.
The solution consists of machining the grooves in the saddles at various locations according to the string spacing intended for each string. First off make sure that the neck is wide enough for if you want more spacing. This proved helpful for me in the lower register as the thick low B and low E tend to reduce the effective string spacing to 16.5 mm on a bridge with 19 mm center line pitch.
Thanks to the folks at Hipshot products, you can submit handsketches of what you want and they will pretty much machine the saddles to your spec at the cost of less than $10 per saddle. I find it great that a standard guitar hardware component company takes the time and the effort to make sure your needs are met as a player.
This turned to be well worth the expense as the playability was greatly increased.
