Tim:

The Deardorff V11 front rails are 1 9/16" wide and have a metal side plate affixed to it that has the drive gears along the bottom of the wooden rail for forward and rearward motion. This metal plate has flush mount screw driven into the side plate and adds structural stability to the rail. This front rail is 3/4" thick. The real rails are the same proportions. Let me know if you needs pics or have other questions. I use a 35" Red Dot in Ilex #5 with the V11 and it handles it with ease.