That's a good thing about the 501 - there's masses of space to fit all the radio gear
I put the speedo on the left behind the motor, and the receiver opposite the speedo so I could still get to the motor mounting screws. I'd heard about these new low profile steering servos and I got one in the shop the other day, but I havent had a look at it yet. I've already got a metal geared 2133 in there, so I don't think I'll bother replacing it
At least there's plenty of room for a brushless setup for the outdoor series this year
-Steve