I wouldn't say that it's simple to put together; soldering is required, and there are a few steps where you might wish you had a third hand. You can see all of the assembly instructions in the user's guide
. Once it's assembled, it should be pretty easy to make it drive around, since it's just a matter of calling the appropriate functions from the Arduino library we provide. You can make it as complicated as you want by adding additional sensors and hardware.
It should be able to easily carry a canopy and extra electronics. Mini-sumo robots have a weight limit of 500g (approximately a pound), and I expect it to be able to tolerate at least a few pounds, but that also depends on the motors you choose to use for it. You'll need more torque to carry more weight, so you might consider the 75:1 or 100:1 HP micro metal gearmotors.
By the way, you might be interested in our 12/12/12 sale
, which started today and goes until the end of the world (or through Dec 21, whichever comes first). We have select items on sale for $12, $24, and $36 (the Zumo and our micro metal gearmotors are sale items), and you can get 12% off everything else.