Cool. The RF was OoS when I tried to order it, so I got the Berg 2.2. You could probably put the 10.5(?) motor in there and get more speed while still having good low end control. I have noticed that Tamiya still uses Phillips hardware, too. You could take inventory of all the screws and order the hex-head replacements. I recommend
http://www.microfasteners.com/catalog/ if you decide to do it.