I've ridden the Oklahoma and Texas portions many times, but only on a motorcycle (or in a car). I can only think of one section that is even borderline bicycle friendly. If you have specific questions, I'll try to get you some better information.Demands of my overall route make both the Southern Tier and Western Express too far out of my way. Route 66 was a godsend really. And it's historic and romantic interest add interest to what would otherwise be a lot less interesting part of my journey. Being as this is a westbound trip, I am already prepared for headwinds. That's one of the reasons I'm only planning on doing 40-50 miles a day.
You mention a possible spring crossing. LOTS of gusty winds (high) combined with miles and miles of interstate dominated with truck traffic. Not fun.
Also, being originally from Southern California, I have had experience riding freeway shoulders; I have traveled I-5 from Castaic to Grapevine many times. However, there are two sections of 66 that will reduce this, as their alignments diverge from I-40. One goes through Oatman*; the other, National Old Trails from Needles to Chamblis, will relieve the freeway traveling somewhat. And without adding more than a day or two to the journey.
Oris' journal was what convinced me of the practicality of this route (and actually April is the time I estimate I will be traveling it). As for any info you have, I already have the EZ66 guide, as well as the lodging/dining guide. However, neither of these say anything about places to camp. If you have any info or rescourses on this I would like to know, as it could fill some gaps as well as lessen the expence (motels are expensive on this road! )
*Yes I know, and I happen love narrow windy mountain roads, especially if they have some historic/romantic value. I'm actually looking forward to that part!