Robot Ideas.. Hummer RC/ Mini-itx / Serial

Brain: I'm thinking of an epia TC6000E it has a DC-DC controller. and I can run it off a cf card (not much memory) and add a wireless card to
control this robot through the web: (as well as have some programming)
http://store.yahoo.com/logicalplus/viaeped60fac1.html
Body: I'm thinking for a body one of those Hummer H2's from walmart.. really large (enough for my mini-itx)
this one is pretty cool there's room inside for it:
http://www.walmart.com/catalog/product.do?product_id933521&cat 3160&type=5&deptA71&path=0%3A4171%3A4199%3A133160
this second one has 19V battery which means it's pretty strong.. strong enough to carry the minititx.
http://www.walmart.com/catalog/product.do?product_id933520&cat 3160&type=5&deptA71&path=0%3A4171%3A4199%3A133160
(I have one of Acromnames gp 1.0 motorminds too i can delegate some of the driving to )
Control: Ideally i'd like to control front/reverse and direction using a dual H-bridge (dual H-bridge) and a serial port.
looked at the Motor mind B/C but not sure exactly how to get those working on com pots.. http://www.solutions-cubed.com/Solutions%20Cubed/index.htm
any suggestions for hardware and software would be appreciated.
planning on using this robot to chase after the dog while i'm at work :) thus adding a webcam and web control :)
hopefully u guys can help me put the hardware together
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