Polish MILMAG gun magazine has published several images of homemade firearm modifications from the Ukrainian conflict. Reportedly, the photos are taken in one of the self-proclaimed republics.
On the top image of this article, you can see a laminate bullpup stock made for the SVD rifle. It would probably be a good idea to add a wooden or polymer cheek piece to the top cover of the receiver which in such bullpup configuration also doubles as a cheek rest.
Bullpup conversion of the SVD rifle has been factory made by the Russians and is designated as SVU rifle.
In the next three images, you can see a rather interesting bullpup frankenrifle. At first glance, this looks like an AK bullpup conversion. However, if you look closer you can notice some unusual features. This rifle clearly has a milled AK receiver and AK safety selector lever. However, the upper portion looks to be an SKS rifle which has been mated to the AK receiver. You can see the distinct SKS takedown lever on the rear portion of the receiver. The bolt handle shape and absence of a long stroke piston also tell that it most likely has the SKS bolt carrier group and short stroke piston. Note also that the magazine release lever is in front of the magazine.
Next up, there are images of AK-47 folding wire stocks. As you can see these are very rudely made ones, but they should be good enough to do the job.
And lastly, there is an image of homemade suppressors, which are probably made for the AK-47 rifles too considering the domination of Kalashnikov rifles in this conflict.
If there is any other curious design feature that you have noticed, let us know in the comments below.