As far as a sling option you can take pretty much any single-point sling and attach it to the sling mount that's located at the base of the back stock. Keep in mind that it's located on the right side of the rifle while the stock is extended and opposite while folded. Don't know how much difference that makes but it certainly hasn't made a difference to me on my Bulgarian AKS-74. For my purposes I'm going to throw on a Russian issued canvas sling. I just ordered one for my Russian-esque underfolder and I'm fine with it (although that particular system is two-point).
You can order a cleaning kit from K-Var (http://www.k-var.com/shop/home.php?cat=284) and it'll cost you a whole $12.00. Poke around the internet some and you can get them even cheaper. Obviously, you don't have anywhere to store it with the side-folder but it's self-contained and you can drop it wherever you keep the rest of your cleaning crap. Also, K-Var is a good source for getting AK pieces parts. I would bookmark it if I were you. They're also great to deal with.
As far as a flashlight, you can try this guy if you want one actually made in Russia for AK's (http://www.avtomats-in-action.com/). He has one for sale at (http://tantal.kalashnikov.guns.ru/akbstparts.html) and, though I've never done business with him, I hear he's great to deal with. I believe he ships out of Texas. He doesn't have prices on his page but there's a link to e-mail him and he'll send you a current price list on everything. Also, his sight is great for project building and stuff like that. He's got a lot of great builds if you're interested in realism with your AK.
And last thing, depending on the builder, Romy G kits can be good or shitty. I bought my Russian Underfolder from Lancaster recently and it's a Romy G kit build as well. The guys involved with Century have some of the worst reputations in the AK world and I, personally, wouldn't touch something they built with a 10-foot pole. But that's because they seem to have no system of quality control in place. They don't even care if they're rifles work when they build them, never mind the shot out/dog shit quality of their parts. Lancaster, however, seems to have an extremely competent staff that obviously knows what they're doing. My recent one not only looked absolutely beautiful but performed perfect. Everything on that rifle was smooth. Not too tight, not too loose. Everything on the entire gun was like that. Perfect. You probably paid some money for that piece but got a pretty good rifle in the process.