Hi Nakes,
The Stock on the Type 56-2 is in fact a real steel stock design taken from a later derivative for the Type 56 the Type 81-1.
Perhaps the ideal was to leave the left side of the receiver free to allow the installation of a Combloc Optic mount in the future that was never implemented.
Changing out the stock from folding to fixed is something normally done at armory level. Maybe removing the Plastic cleaning tool box in between the stock will give you a quasi AKS-74 look.
Drill out old rivets and remove old rear trunnion that has the folding stock mechanism. Install a new trunnion (Make sure it's for the Mak90) with mounting points for a fixed stock and rivet it into place.
Or
Sell the Type 56-2 and buy a Type 56 or LCT AK as they have abit more customization parts available.
Hope this helps
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