Another option here might be Hope hubs. The centerlock models max at 32 hole, but they have a 6 bolt hub that goes up to 36.
PWB has them priced at $330, and combined weight is a respectable 485g. On paper I'd choose this over those Velo Orange hubs, which seem really heavy (assuming 620g is correct). Though 105 hubs are pretty heavy too (526g), so this may not matter to the OP.
Regardless, going back to the OP's original question, I wouldn't let 6 bolt vs centerlock drive the decision here, but if you really want centerlocks and your wheelbuilder can't get Shimano, it looks like the only 36 hole option would be the White Industries CLD. It's a nice hub with a great reputation and will likely last forever, I know a prominent local wheelbuilder in my area who prefers WI over Chris King - but they are expensive.