Good luck on the project, I've wanted to do the same. Always liked the idea of using the EAA/Baikal SXS .410 for a donor but not sure the lockup is up to it. That, and I prefer double triggers, which the EAA does not have. Savage 311 is another but runs into the same issue of "is the lockup up to the job?" Always liked the idea of a DR in .22LR too for some reason.