Looks good, especially for cant work, locating the wheels in the same plane as the bar is the best way to minimise mill frame racking
What you will find is that when slabbing the top/ bottom most parts of the log the lower/upper parts of the bar clamp will make contact with the log before the wheels will.
One way around this is to locate the wheels further forward of the front of the clamp but of course this will be at the expense of cut width.