Welcome to the forum.
That's a pretty ambitious undertaking but if you have enough time you can certainly do it.
I've completed about 80% of Route 5. I still have the northern part of Section 3 and the southern part of Section 4 to finish. I haven't done any of Route 3 or 4 but they are on my list.
I also have several commitments already lined up for next May and June, then two weeks worth in August so I'm not sure that I can shoehorn another trip into July. But, I will keep it in mind and let you know if things change.
You may know about
Benchmark Maps. They make a very good addition to the OOHVA maps which you will definitely need.
Good luck on your planning and keep us posted of your progress. I'd be happy to answer any questions if I can. You can PM me for my email.
Mick