In answer to your questions

1. Yes we have run them in both wet and dry conditions, on tarmac, dirt and sand (Obviously if there is a build up of crap in the tracks clean it out)

2. There is a Stabilisation option available from Tamiya

3. Its certainly not for the novice builder as you have to build the gear boxes etc... and there isn't a lot of room, and the suspension arms are plastic, yuk upgrade them to metal, available from tankzone over here in UK, plus many other upgrades for it.

4. Batteries depends on what you put in it 4000 mah or a 2000 mah and the turrain etc... but you can carry more than one battery.

5. Depends on charger you can ger quick chargers that take 20-30mins or over nigth ones, and inbetween.

6. Turret is plastic.

7. Do you know what I can't remember its been a while but i'm sure they are plastic too, if somebody could confirm or corect.

I hope that helps