Hey Bull; I'm no expert on the area but saw that you were spending more time on 41 (ugly slab) than you should.
This is the route that I would recommend. Others may have better ideas, YMMV etc.
The last stop is the Stonehenge replica.
[URL]https://www.google.com/maps/dir/30.0451462,-99.1450642/29.8055375,-99.2519353/29.7230649,-99.7560929/29.6710148,-100.0071495/30.0444077,-100.0515208/30.0452115,-99.8403805/29.7346513,-99.7612937/29.9373152,-99.6953757/30.0696081,-99.285545/30.0721754,-99.2477412/@29.8712932,-99.9140234,11z/data=!4m17!4m16!1m0!1m0!1m0!1m0!1m0!1m5!3m4!1m2!1d-99.7714824!2d29.7747307!3s0x865ed31f9ee861a9:0x2f82fe9986773e3a!1m0!1m0!1m0!1m0!3e0?hl=en