no, you are wrong. soviet re-equipment passed through its training centres, which invariably were concentrated around their major cities in particiular moscow. so even though major factories were located in the west of the country, these seldom provided re-equipment directly to the front. this has to do with soviet policy on rest replacement and retraining. usual policy was to allow air and ground formations divisional sized and smaller 9including air formations) to be run down to typically about 10% of its strength, then this hardened cadre, would be withdrawn to a rear area, some hundreds of kilometres behind the front for rebuilding. typically this rebuilding occurred around their population nodes....the so-called mlitary district training centres, where they would receive their new equipment, and an infusement of fresh manpower. The new manpower was considered expendable, the trained cadres were not. Soviets would go to extraordinary lengths to save those seasoned cadres.
Because the retraining and resting occurred in the home military districts, it was irrelevant where the production centres were. what was important was where the retraining and re-equipment took placce, invariably, as i indicated above, this occurred around places like Leningrad, moscow, Stalingrad, Kirov, Tblisi (in the far south).
So the important determinant was the proximity of the production centres to the retraining centres, not the proximity to the front. In the initial 6 months there was an enormous strain on the soviet rail system as fully 35% of its industrial complex was picked and moved often more than 1000km east. This had largely been completed by the end of 1941, so that from the beginning of 1942, there was a massive amount of spare rail capacity (although some was of dubious condition, and was replaced and expanded by massive amounts of lend lease rolling stock). point is, that Soviet re-equipment and strategic movement of its reserves was largely covered by the second half of 1942 .
Germany didnt capture a lot of the strategic factories from the soviets, though its capture of manpower centres was a serious impact on soviet industrial output. Allied lend lease largely overcame this by providing huge quantities of foodstuffs, thereby releasing huge numbers of men (and women) for work in the factories and for the military.
So, by the second half of 1942, far from having a negative effect on Soviet production, by dint of huge sacrifices by the soviet population, and good planning by its central comittee, soviet production was actually powering ahead of that of its german rivals, there was no shortage that I know of of most weapons, including aircraft, by the latter part of 1942. Soviets were beginning to feel the manpower pinch, so were spending more time training their formations to higher levels of proficiency. The divisions used to destroy the germans at stalingrad were already in existence at the beginning of 1942, but the long summer of that year was spent getting these formations properly equipped and trained, whilst the germans were kept busy with whatever was at the front at that time. It was a strategy for ultimate victory, and the russians played it to a tee