K.R.A.S.S.H. Industries (Klapaucius Reliable Air, Space, Sea & Hardware)
Built for the Fastest Aircraft challenge 2018:
https://forum.kerbalspaceprogram.com/index.php?/topic/177663-beating-the-record-fastest-aircraft-challenge-2018/&tab=comments#comment-3439153
BOLT is an adaptation and expansion of our Shirley drag race model.
Named after the fastest human alive, Bolt manged 3000mps at just over 29,000 metres. It did lose several intakes to heat at that point but landed safely.
VARIANTS: While BOLT will easily get into space, an extra combined liquid fuel and oxidizer tank placed in front of the cabin is a recommended addition if you want to get into (and out of) a low orbit.