I love the XR family but the Vanguard's mesh has always bothered me. I like the huge cargo capacity, but there was something about the huge landing gear that was as if the ship was on stilts.
While playing around with the XR5 mesh, I stumbled upon a configuration that I think looks nice.
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The XR8 "Galaxy/Antonov" ?
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with 6 SABRE engines under the wings, it can be converted to back/bottom loader. No need for the scrams at the belly either.
Though I doubt that such a configuration would survive reentry, well... neither would the current Vanguard, unless it was made of unobtainium.
Man, I wish I had the skills to model this properly.