Good to hear you’re making progress.
I haven’t encountered the MemoryError myself. I compiled with Python 3.3 myself, but I admit I haven’t tried pandac.PandaModules, only panda3d.core and a direct import. Copying and renaming libpandaexpress.dll to libpandaexpress.pyd should make it importable directly, can you try this followed by “from libpandaexpress import *” to see if this yields the same error?