Completed to Abilene to Canadian border section and am currently on Amtrak on my way back:
http://www.crazyguyonabike.com/doc/mev-route83-2018
Overall a good ride with busiest parts in KS (where I actually mostly took KS 23 instead - still a moderate amount of farm harvest traffic and less shoulders so 83 might have been better).
When the weather gets cooler in South Texas, hope to go back and ride Brownsville to Abilene.