Definitely a great idea.
I think you are on the right track doing demonstrations of different techniques required, instead of doing a whole build. I find I don't have much patience for videos that run too long.
But I do like the ones that are short, to the point, and actually show something specific in detail.
For example, showing how you put the skin on a boat could be seperated into a few videos.
1) talking about the fabric
2) showing how you do the initial layout and cut
3) Short video on how to stitch it together
4) How you get it on nice and tight
5) How you shrink and color it and finish it off.
Looking forward to the series!
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