IntelliTom:
What do you guys think about these ultra-cheap kits from China:http://www.ebay.co.uk/itm/171056734576 ?
I'm thinking for testing it will work out fine. Or should I double my money and go for something like this:
http://www.ebay.co.uk/itm/130936585418
Views welcome
The second one seems to have the wheels more 'centered' front-to-rear. Reminds me more of a Roomba....which does an amazing job of spinning in place. Would probably do a better job of keeping pen centered while turning.