H Benny,

Sometimes external links need to be approved by me before posting. As you can see I have fixed the problem 🙂

Yes 35mm will be fine and be manageable over rallarvegen.

Yes maybe 38 would be better for this mainly paved route.

You should take the regular ferry from Sogndalsfjøra (not Kaupanger) which is direct to Flåm.

Everything else looks good 🙂