"why not make the comb high enough so you could bore a hole through the stock for passage for the cleaning rod?"
Dave,
A high heel is (IMHO) VERY neccesary for prone shooting. When you set the buttplate into your shoulder for a solid position, the higher the heel the better. If the heel is low, the stock wants to; a) slide down off your shoulder and b) not engage the full mass of your shoulder (this results in dificulty in consistantly reproducing recoil motion).
I shoot with a lot of pressure pulling the stock back into my shoulder: Using either a front rest with my hand pulling back, or a target sling (my background is Highpower)
I recently got a similar stock (Richard's benchmark), and ordered it with a 1/2" highter comb and heel. First I inletted the comb so that I could get the bolt out, then I mounted a boresighted scope, dialed up 20 mins. of elevation, and cut the comb down until I got a perfect cheek weld. Then I notched the heel so that I could get a cleaning rod through.
Sure, and removeable comb/heel would have done the same thing, but I was trying to keep this rifle simple. The end result looks very much like your stock, Joel.
I will post a pic when I am done, if anyone is interested.
Doug