I started the inlays:
I bought some premade diamond shapes for guitars.
First I laid the loose pieces on the grip to find the pattern and location I wanted then I made a paper template, made three copies of it, mirrored the image and made three copies of those. I then taped one of them to the corresponding grip.
I termporily glued the inlays in place using the template to align the pieces. I used superglue (bad idea) and released the parts with acetone after I traced around them with an exacto knife. I rubbed white out into the cuts so they were more obvious.
I then used a dremel to level the bottoms of the cuts for the inlays, staying away from the lines. I then used the axacto knife to cut out from the lines in.
One side done, I have to epoxy them in yet but I'm waiting until the other side is done.
I used my phone to take the pics, sorry they're not too clear.