In order to end-up with something similar to my build do the following;
Start at http://www.carolinashooterssupply.com/default.asp. (Whatever you are not sure about, email the staff, they answer quickly).
For Saiga rifle model 1Z-32 (AK) order Part Kit SKU#: CSS-RIFLE-2-T6-5PC (including stock, grip, trigger guard, trigger group, hole plugs) $152.
(You will need a separate bullet guide, if you wish to use Mil-Spec Magazines)
For side mount; Check out www.kalinkaoptics.com. Depending on your rail height preference, look at BP-02 AK to Weaver Mount, Low Profile, Centered (AMBP02) $7