Some very interesting ideas on weight saving, when I say interesting I mean good. Maybe not for the harsher/heavier rider but I can see something like that doing me rightly. I'd maybe suggest getting a rat tail file and filing your chamfer's around the drilling bit's, mainly for aesthetics but in theory it would also remove any stress risers same would go for the rims too, but I'd imagine you've considered all this before taking the dremel/drill to it! still, very nice indeed!!