Well because the motor runs on 4 Hvy. duty bearings it's works great and it runs true without any over weight hang on side.
I have not tried a 3 1/4 HP router but the 2HP is just fine....
I guess you could pull the motor a make a bracket under the arm but it would hang down a bit more than it should not say anything about putting it into the bracket mount.
The end mount is quick and easy (4 screws and it's ready to rock and roll, so to speak) and I do use the RAS for many other jobs.
Plus the motor cradle can be moved to any place over the table like most RAS can do,
and can be locked in place if needed.
I take off the saw blade and unplug the saw and then just mount the router, it's makes the hard router jobs easy.
I did have a error with the run out on the end of a pass but I did reshim the table top to fix that error.
I should note it can be used like a Pin Router if you put a pin set up under the center of the router (in the table top) I just swing the router to the front and put the pin in place and then drop the router down and do the work just a like a pin router setup.
I used a broz.wheel bushing to hold the pin in the table top,that way I can just press it in place quick and easy, I have replace the table top many times and the last one I didn't drill the hole for the pin set up becasue I have a pin router setup now.