the platform looks good, and I like the big battery - good thing your robot can carry it.
a few things I'd like to point out:
- don't use LPT1 . some time ago it was my first approach since it is so easy to connect things to the lpt1, but is it very limited. Instead learn about microcontrollers, and do a little board with a simple atmega8 that would handle the sensors. It is very easy trust me (if you did that platform learning about MCU's will be a joke). Then the atmega8 can communicate with the motherboard via a serial port. You are no longer limited to 8 lpt1 pins and working with sensors is easy.
- you might want to use bigger wheels, the motors will have a bigger load, but it will be able to walk over small obstacles.
- for sensors you can use: DS18S20 digital temperature sensor, PIR sensors detecting motion reliably, ultrasonic sensors for distance (expensive, but you can build your Own)
- if you decide to use a MCU, you'll be able to hook-up a GPS module (instead of connecting it to the Motherboard).
Looking forward to your next videos. good luck