When u say "unlimited option", do u mean what we can add or that we can also modifie all what is proposed for a model knife (even changing the size of the blades)?

Personnaly if it was possible, I will say:

.Model 28 reduced hilt; single finger grip instead of border patrol; white or orange G10/ or micarta; with F sheath.

.Model 25-6 reduced hilt; full handle stag or micarta or leather or white or orange G10 or white micarta handle. Black spacer with F sheath.

.Model Fireman reduced hilt white G10 or Ivorite with F sheath

If it is possible to change the size of the blade

.Model 23 5.5 blade polished stag with grips black spacer F sheath

.Model 3-8; 3/8 stock single; black spacer; 4 grips stag and ... F Sheath