Thanks guys for all the suggestions, some photos to below show the front as it is now after sanding with 400. Also the belly cut query from earlier, it wasn't super obvious (like it is now) at the time that it was a veneer back.
I think I will go for a reasonably solid finish with no or little grain viable as the front grain is not that appealing where it will be most visable with a burst finish and there are some other imperfections (which I had hoped might improve with a good sand) such as on the top side where you can see the top piece of timber is not complete in the middle of the cut in (which would be hidden in a burst finish I know), the timber joins are visible and are not square to the rest of the guitar, you might be able to see that against the switch rout or the neck Pup rout if you look close enough, its miles out.
So from here I have some questions:
- How far do I go with sanding before applying the timbermate grain filler?
- Do I only need to do one coat of timbermate?
- How long does the timbermate need to dry before sanding back?