surface thickening

[xxfast]

Hello, everyone.
I am trying to get an attachment file thickening, but I probably can't properly shape the surfaces to join them and then give them thickness.
with solidworks are not very experienced in surface modeling.
Who knows how to help me?
Thank you.

 

[xxfast]

solved by changing the type do solution, but it would still be interesting to understand how to combine the surfaces... .

 

[LaboratorioDieci]

combining surfaces is the least, the command is joining surfaces. However, the surfaces you created have very tight folds that put the thickening command in crisis.