the .06" spacer seems correct from what I remember.
The Zvezda kit is the better one overal, but not by much. If you are going to replace the tracks anyhow, the Zvezda kit will probably be a better place to start from. Great models has the Eduard PE set right now:
Eduard JS-2 set at greatmodels Sometimes you have to search for js-2 and sometimes is-2.
The Model Point barrel is probably a good investment if you are into replaceing the barrel ( I have not seen the JS-2 barrel, but all other MP products I have seen are worth a good discount price...the one I saw was on GMW for $16.95)
You may also want to look into the Aber line, I think they did something like fenders or such a while back...might be a eBay search though...