To remove excess material, I use a belt and disc sander, like this :

Here is the result after few minutes :

On the bottom rear, I had sand 2 mm without the need to finally add plastic sheet, because visually, the withdrawal from the lip located at middle height (between the upper and lower body ) is rather better as is now to my taste. Before sanding, with a pen, I marked the edge to see how far I was going.

Taking the size the edgings before sanding

First run

Second run

The dashboard does not suit me. The studio model seems to have been broken and repaired on one corner (already sanded in the image below), and the two panels were not straight (not a problem when the screen time is short, but it's ugly when viewed as an exhbition model, so it is sanded (by hand this time, beginning with an heavy grain sand paper)

The result is made flat.

The upper and lower body were slightly crooked molding, these parts are recovered by a passage in the boiling water. (Sorry, no photos)

The lack of material in the upper part of the body are filled with Tamyia bi-component filler (I do not use it often, and I forgot how this thing stank !). A small area of the lip on the rear right is filled because I too supported the sanding here.

And now after a new run to the sander.

The underbody is carefully drilled from side to side to hold the 3 wheels axes (not supplied). I also planned a plastic tube to bring the wheel to the right upright. The hole is enlarged of a few mm deep in order to insert it later. I will play with the tube length later.

The wheels are prepared (sanding, putty, center drilling for the axes).

The rest is less interesting for the moment: putty, sanding and so on, mainly on the upper and lower body

Same job for the character: cleaning, filling ...