Does that type of folder work with a fixed stock receiver configuration? If not big costs for mods. You will also need the receiver modified to accept the stock latch. You need a hinge block for mounting the top cover. Does your folder come with the stock latch hardware? You will have to have the barrel reworked to accept Krink parts. Build costs for a smith to headspace the barrel and refinish the rifle. Then the purchase of the other parts that you listed $$$
Consider the following. Sell your two receivers, parts kit, and folder stock, then buy the semi-auto version from Arsenal. Do a Form 1 for the SBR. Cut off and crown the barrel, then screw on the flash hider and you are done. It will be cheaper in the long run and you will have a factory build.
Sell me your spare receiver to help pay for your build costs.