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There's lots of info in the referenced thread and it's a great reference.
As far as parts go for C3a1.....if talking original...they're scarce and pricey. I've never seen a receiver or bolt for sale in Canada. Both the original issue beech and McMillan stocks are out there. Bottom metal is same a 1200 clip feed however finish is not bright and have to be redone. Could use the MST-100 scope as it's close to the 10x Unertl. Saw a scope bracket (original) go for $1200 last year and the guy did a happy dance at that!. Have seen mags as well. Barrel....good luck....you'll have to profile one or call Rob McCellanan.
I've beat a lot of bushes...advertise here on EE and a few other sites. I not had much luck doing this...the items I have were brought/horse traded from folks I knew.