Great! Would like to see FElt workin gin FreeCAD.
Make a nice proposal. I would like to help you, and possibly mentor you as well, if that is acceptable to FreeCAD admins.
GSoC is a nice motivation for students to contribute, but it do has some luck factor, in addition to quality of your proposal, which includes availability of slots, priority of organisation, and availability of mentor.
The beauty of Open Source is that to experience happiness of contributing does not need presence of GSoC. If you get GSoC, that should be great, but I would like to see you contributing even without that. I am willing to mentor you in either case.
I will also keep giving my inputs for ReBar addon, as I am going to be user of that in a big way.
Wish you all the best.