How to craft weapons and masks

Ok, so first of all, a color and a mask are not the only ingredients to create a custom mask:

A custom mask consists of a form, a color scheme, a pattern, and a material.

Also, from what I've seen so far, the color only applies to the pattern you use during the craf, which explains why my mask was remaining white with a simple colored pattern at the top of it.

For a complete list of masks, patterns and colors, you can check out this wiki.

The tips I can give you is to bring 2 bags of ammo along with you aswell for the bank job. Also don't place an ammo bag to soon because with the low effectiveness of the saw you are surely going to need it the 2 ammo bags to get through all the lockboxes. Edit: Taking ammo from the ammo bag also refills your blades.

Just set them up and keep on sawing, the saw system is also abit lacking in that you have to aim it correctly to actually open the boxes. You need to aim at the right hand side of the boxes and use the saw like you would use an automatic gun, you need to burst fire. Because any additional hits against anything (in the air you don't lose your 'ammo') will take away the 'ammo' for the saw.