I made a range block once, for .22 LR when I shot that in bullseye competition, but for reloading... get an MTM and don't look back.
If wood's your "must have" then ... I 'spose you're gonna have to drill it on a drill press, to keep the lines nice n straight. You're gonna have to round the edges with a router. You're gonna have to sand and finish it. And... most likely have one for each caliber. The range block I made was of dense pine, had 10 openings, and rounded corners as well as a double rounded top. The finish was a sort of antique brown with several coats of real Tung Oil (not the big box store stuff). Looked very old when I got done with it