I'm sure others have more experience and MUCH better ideas. However, I've done a couple custom wallets since starting out, both with 4oz backs and full pig liners.
On the first, I skived and turned the edges of the back over the pigskin. I just prefer the look of turned edges on small goods... It looked okay (the owner actually loved it), but it was too bulky for my taste.
For the second one, I actually made the pig liner oversized and turned it over at the exposed edges. Much cleaner look and less bulk. I also made the back a fraction large as well and trimmed everything flush after sewing. Just did my normal burnish / finish / burnish / seal treatment and the two leathers blended well and looked fine.
Good luck with the project and let us know how it turns out!
Mark
