What would you pay for a 3D solid??

[sunkistcamaro]

Hi guys,
Im looking for advice on how much I should charge to model in 3D.
It's just for a side job, I do this stuff all day long at work but I was just asked to do a few jobs at home. This guy I know works with me but he is starting a business of making custom chopper parts. He will be taking the solids and buzz them out on a CNC machine. I wouldn’t charge him anything if it was for his bike but he will be turning a profit. I just don’t want to be the sucker who does all this work for nothing…
What would you be willing to pay to see your ideas in 3D, make changes to and get a solid to have a program written?



Thanks