Few Things the video review covered that are worthy of Note:
Barrel length on AK-47/74 rifles in 7.62×39 or 5.45×39 can be shortened without a drastic loss of FPS unlike AR-Patterned Rifles in 5.56. So when you go from a 16″ bbl to a 12.5″ like the one found on the PSA AK-104 you only roughly lose 100 fps (around 2200 fps). Not bad.
As far as accessories go I am a minimalist. I would not bother with the TDI Dogleg rail if you are running an Ultimak. Mount a solid budget friendly red dot like a Holosun or Primary Arms Mico scout style and a light mount and call it a day. (If you wanted to mount a rear optic, using a quality side rail mount would be more stable IMO than the TDI Dogleg.)
All the other stuff like the Charging Knob from TDI you can leave off. I *might* try the hand stop by Slate Black Industries and of course a Standard 2 Point Blue Force Gear AK Sling in Coyote Brown.
The only variable for me on this gun is the stock or brace. I have a few ideals but I am going to have to wait until I have the gun in my hands to make a decision. When I built my M92 I used a spacer from RFT that worked really nice with the SB-47 brace. That would be a great alternative to installing an AR adjustable brace IMO.