I think alexD92 is referring to cutting up and altering a BD-3008 to create a Sten reproduction. That would make a very expensive Sten repro. And given that the RCMP consider the Sten magazine housing to be the receiver, the BD would just be a very, very expensive parts kit, that would need to have its very expensive bolt cut and welded. Even if cost were of no concern, a 3008 bolt, cut, rotated and welded would be a poor choice for a Sten clone. Sten feed and ejection is directly across the bolt, feed horns and extractor are 180 degrees opposed; 3008 is not. A 3008 ejects up and to the right.
Years ago, prior to the US 1980s freeze on new full auto manufacture for non-institutional use, Sten types with bottom feed were being legally assembled. This necessitates vertical ejection. IF, and WHEN a case ruptures - which does happen with Stens, particularly with some ammunition, the shooter is at risk of getting hit with case fragments. There is a reason that little plier type broken case remover was issued with Stens. This has been an issue with 9mm PPSh conversions.