Unfortunately, Archos tablets do not come with gorilla glass nor titatium unibody. The pre-requisite when giving anything to a kid.
As for the firmware, i'll have to recommend that you manually download the firmware update for the last Eclair firmware. The Froyo update on has the basic android functionality working and they're still working on getting the archos functions back in. The next firmware update is apparently more stable and more functional than the initial Froyo so i'd recommend to wait for that before updating to 2.2.
Regarding the app market. Google Market is not tied to the OS. It's just a regular app like any other and can be installed without the need to hack the phone. No different from you downloading an exe off the internet and running in on windows (You don't need to hack windows to do that either). There are two different markets however, there's one designed to work with Eclair and another updated one for Froyo. Either one can be installed easilly.