Sumovore finished
Well I finished my Solarbotics Sumovore finally. I had a soldering or IC socket problem by the results of my debugging with a soldering iron.
The only disappointing thing is that I don't know of anyone else with a mini-sumo robot locally, so I haven't tried mine in a competiton yet. 
Perhaps I can make it to an Ottawa Robotics Enthusiasts meeting to play-test my stock Sumovore.
I also purchased a Pololu five inch Round Robot Chassis with Tamiya twin-motor gearbox with DC motors, Tamiya truck tires, and Tamiya ball castors from Robotshop in Montreal for $33 Cdn. I think that is one of the better prices for a simple robotics mechnical platform. Using this photo assembly guide for the Tamiya 70097 twin motor gearbox (784KB PDF, local mirror) from Camosun College (Victoria, BC) assembling the gearbox is easy, rather than trying to read the mostly Japanese instruction sheet.