I think everything is worth having a go at, but you may struggle with some of the finer subtleties of the second image.

The limitations of Fontstruct can be very frustrating, and rewarding once the final result is achieved.

If you are going to use a fake Bezier curved effect with the composite bricks, you may as well scan your sketches, then convert to paths, then tweak in Illustrator, and finally transfer to Fontlab or similar.

However there is nothing wrong with doing a Fontstruct version to see if it will work.
I sometimes do an angled Fontstruct version of a font I am creating. This creates a foundation for me to work upon. Then once completed, I upload it into Illustrator, and add the curves, and other finer details. This is ultimately a lot more work, but immensely satisfying, as there are no 'awkward'. 'ugly' or 'impossible to create' letters in sight.

Hope this helps.