hi alll...very nice truck. just an observation from an engineer, why make that clamp? you are putting the stress on the servo casing where it is not designed to mount on. why not just get a 5-6mm thick oblong of ally10-15mm bigger all round than the total size of the servo, mount that using the screws that are allready there (they may need to be longer) then cut out the centre of the oblong to the correct shape of the servo using the correct mounting holes.
i would gladly machine that out on my mill but i live in uk so bit far away