Thank you very much guys for your constructive comments!
Once the final version will be ready there will be a demo video of it.
@Samon - the lever that open it will be always pushed against the stop pin as long as you use the coin - this should translate in a locked blade so it should be safe
(the video will show it at work); related to the grip itself i am sure it is "fat" enough to offer a good one - as this is not intended to be a swat force knife
All the best!
Bogdan