I used Microsoft Visio to draw it. Been using it for about about 15 years - as long as it has been out and before it was bought by Microsoft.
The I took a picture of my PowerPro 205 at the same angle as viewing the cart from the side and then cropped it with Photoshop CS4.
Respective of the recommendations, I will be moving the wheels forward and extending the tank deck to accomodate a larger tank. The front frame is almost done. I had a chance to work on it last night.
Since I had envisioned using L-channel as my rear axle mount to compensate for the 3/4" or so caster height difference, All I need to do is just extend the tank deck.
Stay Tuned!