Developing a shell like surface mesh

Hi team!

I am looking for some advice to build out a shell-like surface mesh that envelopes my current geometry bodies (muscle-tendon unit).

I was wondering if it is possible to build out an extrusion (say 5-10mm) greater than the original geometry dimensions.

Alternatively, even a simple cylinder mesh to encompass the original geometry?

Ideally, I am planning to utilise this shell as a way to constrain the model using FEM.

Any help would be much appreciated.

Cheers,
Scott
BFLH_version4.cub5 (2.5 MB)