Fusion 360 Model Modification

I made a Fusion 360 drawing from measurements on an actual part, but made several errors. I'm new to Fusion and don't have the expertise I need, to correct it. I now have the original drawing of the part, so have more detail that I missed when I created my model. Even so, there are features that would have to be modified from the 2d drawing. If it's more convenient, start over from the 2d reference drawing, although the finished model should be in Fusion 360.

The model is 1/8 scale from the original. It is going to be 3D printed as the pattern for casting. The drawing is for the finished, full size part. Hence even after scaling, any finished surface would need draft, machining allowance and core prints. Please indicate in your quote that you understand what these terms mean.

The finished model would consist of 8 parts:
- 2 part pattern
- 2 part core boxes
- There are left and right units, so mirror images of the patterns and core boxes for the other side.

More information available should your quote be successful.

Timing is not important.

Requirements:
- Dimensional changes
- Adding new features
- Fixing fillets and drafts

Ideal skills and experience:
- Proficiency in Fusion 360
- Ability to read 2d drawings.
- Knowledge of pattern making and casting would be beneficial.

Please indicate in your quote that you have read all of this submission, otherwise your quote will be ignored.