An exact 3D model for pistol grips needs to be made. The grips will be sent to you and you should take the measurements from the actual object. This is a 2 part design, for left and right side grip. After the model is done, grips need to be sent back (I will pay for shipping, of course).
These are Sig Sauer P226 grips and look like this:
Very slight modifications have to be made from the original grips, these will be detailed later and they don't change the complexity of the model.
It would be ideal to have the model made in Fusion360, but that is not a must. STEP with original program file (Inventor, Solidworks etc) will work as well.
I can also send existing 3D design file for measurement reference, but as this has several mistakes in it, it would be best to measure everything from the actual object. I can detail later the mistakes in that file and things...