ISSF 10 airpistol grip design rules

[CrocDuntoc]

I have just bought an Izzy 46m, which I like a lot. However the grips are huge for my small hand (I plan to carve to suit shortly), and the rear of the hand shelf at the heel of the grip sits awkwardly (and painfully) on the bone (carpus?) just in front of my wrist. I understand that I cannot extend the shelf to risk touching the wrist, and that I cannot carve it to curve up to match the shape of my hand...

Can I round the shelf edge downwards to make it less sharp?
Can I extend the shelf out wider to the side (to the right on a R/H gun)?
Can I extend the shelf rearwards IF there is no danger that it will support my wrist?
Are there any drawings out there that illustrate compliant/non-compliant grip designs?

Thanks in anticipation...

 

[Mike OTDP]

1. Yes
2,3. Yes, but the gun must still fit in the sizing box.
4. See http://www.formgriffe.de/en/ and www.nill-grips.com for examples.

 

[CrocDuntoc]

Faster than a speeding bullet....

Many thanks, Mike OTDP! (and thanks for your earlier shooting tips posts too)