What is your budget?

I could build that same robot for around $2000 using mostly used parts, and a lot of time.

The best thing to do would be to grab the spec of it and see if you can get the parts together.

Used electric wheelchair motors, snow blower tracks and a fabricated metal chassis alone are going to run you $500.

The you need to add electronics, 20+ amp motor controller, SLA or lipo batteries up to 24v, fuses, breakers, power supplies.

At least an 8 channel Tx/Rx or a laptop and/or wireless modem like an XBee.

The the arm and gripper....

You're in for a long ride. I'd start smaller.

I built this thing for around $1200 as my first large robot - http://youtu.be/kITSnt1fPd4