This web page has the majority of the dimensional information:
wood rail specs If you need info on router bits, size and depth, contact me via pm.
To be honest, you'll spend
at least $100 in supplies if you go with white oak. On top of that, you have to consider your time, needing a router and drill, sander, etc. $200 for an
original set of rails, especially if it comes freshly stained and poly'd, with rear mounting brackets, sounds like a bargain. I have been making new sets - drilled, stained, poly'd for about that after shipping, and my profit margin/hourly rate is marginal, I'd be better off working at McD's. But I've enjoyed doing it...to a point, so I would never discourage you from doing it on your own - it'll be very rewarding.
AJ's got a set in production, but I have one last set in the shoots. If you decide agains doing it yourself, or if the original set on CL isn't cutting it for you, you know where to find me.