Well, that seat needs attention but you know that.
You could get a genuine Alaskan Leather sheepskin seat cover and that will give it the real ADV look.
A skid plat/engine protection is a good idea even on gravel roads.
It is going to be a great bike and you will really enjoy it.
I have a wee-strom and I agree with you, it is too heavy, too much plastic, and too tall.
An SV is a great way to build your own.