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Again, your video was very well done but:
The dimensions would be my number one question, is it 1cm? 10cm? 100cm? a meter??
Second, to me, would be its usage, in other words a "How to Use" section. To sell this you need to appeal to the novice user. Modelers who have never seen something like this and have no idea what it is good for,
Third would be the experienced modeler. You're going to have to show them that YOUR bender is better than... or easier than...better made than... Else why would they want to buy your bender
I'm not selling, since there are model shops. I care about the comments and the construction. Coloring, functionality.