Alex,
In general lugers are remarkably interchangeable but they also were also built to close tolerances and required hand fitting to function well. Your mismatched gun is apparently one that was reworked by a Russian or East German armorer and may function well despite the mixed parts.
In my opinion, if it works well enjoy it as is. It is a shooter: replacing the frame will not make it into a collector grade Luger and it just might cause problems with proper functioning.
I suggest that you shoot and learn from this Luger and save the money you might spend on a replacement frame as a down payment on your next Luger.
KFS
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