Guide rails causing errors

[murphy.sean.brendan]

I've been working on designing 3D prints for a costume I want to make.  (Note: I am new at Fusion 360, but have used AutoCAD in the past and have been watching tutorials on how to go about it)

This is specifically the humerus armor cover.  The ultimate goal is having it in multiple pieces with some recessed sections for lighting. The piece itself is like a shell.

The trouble I'm having with this is creating the shell.  The lower section isn't a problem as much as finishing the top curved section.  I've tried adding in additional "ribs" to help it make lofts, but so far it doesn't help.

If anyone has any idea on how to go about making a shell for this, that would be appreciated.

Here is the link to the file https://a360.co/2mtjgaV

Thank you very much!

[TheCADWhisperer · Accepted solution]

This isn't exactly a beginner project.

Have you gone through the tutorials?

Are your sketches fully defined?

Are your rails and profiles coincident connected - or can they be dragged all over - not showing any connection to each other?