BG! You are awesome! Another cow tunnel!
If it isn't a secret, tell us where and we'll organize a Grand Tour of Commonwealth Cut and Cover Cow Tunnels.
On the other hand suggesting a 2500ft climb, 47 mile jaunt before my last Quixotic assault fades from memory is harsh. Couldn't you have waited a week or so? It looks like a terrific route through beautiful towns. To add insult to injury it is tempting to hop off busy Rt 101 and add favored back roads of Temple and Wilton Center to the route. Temple Pass west to east looks much more challenging; 9%+ grade is "pyreanical".