Bob, honestly, use the S10 frame and just quietly save the old frame. My reasoning is this: When its all said and done, you will have welded new perches for the motor, boxed in the frame rails, completely changed the dynamics of the steering and front end, and then there is the associated braking system, etc. To the point where nobody will want to go to the trouble of putting it back to original.
On the other hand, and this is really a sincere comment.. this is YOUR project and your money. Its nobody elses business what you do in ANY case. I am just helping with reasoning. I totally understand both ways.
