I just finished a similar weapon, a 7.62x39 Saiga that had the trigger group, AK mag mod and bullet guide installed.
I nipped the barrel shroud with a tubing cutter, threaded it and installed a phantom-style FH designed for the mod. It is bored to fit over the remaining bit of barrel shroud on a Saiga conversion. For the AK front furniture I used a clamshell lower retainer and a modified Saiga gas tube. Made life simple and works very well with the Hogue AK hand guards I used.
The parts came from Dinzag Arms. His site is at: http://www.dinzagarms.com/index.html
Brian's service and communication is top shelf and the parts I purchased were nicely done.