Spokes: DT's are a good, safe way to go on that.
Holes: I have no idea why you are going with a 24h front. The hubs and rims are pretty hard to find, and in general less spokes = weaker wheel. If I were you I'd just go 32h on both.
I was told that I should run 24 spokes in the front and 32 spokes in the rear for if I were to run 32 both ways the ride would be harsh. That and most of my weight is going to be on the rear wheel so logically it doesn't make sense to have wheels with identical spoke counts.
Whoever told you this is full of ****, and has no idea what they are talking about. Your weight should be even distributed over both wheels unless you are riding some sort of weird recumbent. And no kind of voodoo magic would make equal spokes on front and back give you a "harsh" ride.
Lacing: Radial is okay in the front, as long as your hub manufacturer says it is okay. 99% of the time it's a bad idea for a rear, and it's always a bad idea for a flip-flop hub.
My recommendation is to go 32h front and back, laced 3x on both. Easy, reliable, strong, and any bike shop in the world will be able to true it.