Thanks for the compliment and yes, you are probably right. I think this is one of the worst tutorials i ever made although it got the most views out of all my videos. I probably shouldn't say this under my own video though :)
There are a lot of ways to make a hinge. A easy way I show in this vid: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-z14CEm_Gn44.html, or just search on youtube :)
Have you actually tried to print this? I really don't think it will work - IMO that 'bridge' is going to be impossible to print, even if Cura will make a slice for it... but you don't actually need it to go all the way through, just make little cone shaped bits either side.
If have printed a very similar model with different dimensions, but yes depending on the bridging capability you might have to reduce the bridge length. I know about the pin hinge. If you think that is a problem you can either use a different hinge design or make multiple short bridges.
