I’m going to point at the large elephant in the room that everyone is ignoring… why do you want 1941 over 1942?
IMHO, 1942 (either edition) is a superior game to 1941… there’s just more of everything in 1942 vs 1941.
Having said that, sometimes that’s the only appeal of 1941 vs any other game in the A&A franchise. Less units, less income, less territories, less strategic options, less paths to victory… LESS PLAYING TIME… the latter is about the only thing I can think of that might make 1941 more appealing than 1942.
As for the steps to convert 1942 to 1941… you already have more than enough pieces, the rules are easy to print up or look at online… the only issue is the map… and there’s the sticking point… it would cost more to print the 1941 map (short of making a really poor quality map) than it would cost to just buy it in the store new.
Personally, I don’t recommend 1941 to A&A veterans unless you’re looking for a very quick game or just want the unique sculpts… I only recommend 1941 to new players to the franchise… if you really want 1941, it’s probably just cheaper to buy it than to try and print a 1941 map.