Of course it is Fictional. See the imperfections East of Tioga ?? It seems D.N.T. TO I - 35 would be routed on F.M. 121. The two Bridge proposals are different alignments for the same F.M. 121. It could be solved by construcing Frontage Roads particularly in that area. Or they would probably want to realign F.M. 121, or realign D.N.T. TO I - 35. This Beautiful Toll Road would probably have to connect I - 35 in side Texas with out getting Oklahoma involved. This is why The Willis Bridge took very long time to be replaced.
As for the River Crossings being too close to each other: They would be better to simply Twin The Willis Bridge. However, any Highway & Bridge projects would be welcomed by Crazy Casinos. Even Winstar would benefit from a D.N.T. / O.T.A. TO I - 35 ... They would ostensibly construct more buildings to Face The Beautiful Toll Road.
I also completely support converting Spur 503 to be part of D.N.T.. Do not downgrade it to a Surface Boulevard please and thank you.