Well, I understood every word.
Loved the novelty of the video, great idea.
It gets the scrap it vote from me too. It's had new front out riggers, a new rear cross member, the inner chassis rails where the gear box cross member bolts to is shot (very common place which is hidden from sight behind the gearbox cross member flange) the front end, near the dumb irons, is shot. And as Disco1BFG says, it'll be worse on the inside. Mine was similar to yours and when I cut it up it was pretty deep in rust scale inside some parts of the chassis rails.
The best advice is to go galvanised if you can. TorsionBhudda is spot on though! Once you invest in a new chassis you feel compelled not to waste it by bolting crap stuff to it and so cost creep up - a lot
I think the same phenomenon will happen if you build your own from scratch, though creating the chassis yourself should give you a cheaper start.
I've no idea how insurance companies react to home made chassis? There's a member on here called owl who built his own chassis for a competition Landy. His build thread is
HERE However, I think he just uses it as a comp vehicle and he transports it on a trailer. ie not road legal. I could be wrong though, because it's a while since I've looked at that thread. It's defo worth a read through though because he does an amazing job. Finished vehicle looks mint
Whatever you decide to do, keep posting pictures of it on here, I reckon you've got quite a few of us interested already. Good luck.