Mk-4 and bigger spaceplane parts

[blazing ibex]

It would be cool to in the future have bigger spaceplane parts to go along with the bigger rocket parts.
What we have so far:
Mk1: Normal plane parts
Mk2: Supersonic/hypersonic plane parts (sr-71 style)
Mk3: Space shuttle parts

My suggestion for bigger parts:
Mk4: (easy to use) SSTO parts (Venturestar style, Star-raker style)
Mk5: Single stage interplanetary parts (Would maybe require orbital construction)
Mk6: "Single stage" interstellar parts for colony transfer (would need orbital construction)

Note: I don't fully know what Mk5 and Mk6 parts would be inspired by so feel free to come with ideas (you could also add to Mk4 obviously)

[blazing river]

Why not make MK4 or MK5 based off Star Raker? It was a Rockwell concept from the 80’s after the shuttle started flying.

[tropic geyser]

Maybe something like the KSPIE 1 peice ssto part?

like interstellar-style

[blazing ibex]

I mean yeah the mk4 could be based off of that too
actually a really good idea

mk5 should be even bigger though imo

[blazing ibex]

there you go, I added it to the suggestion

[blazing river]

or have Star Raker be MK 5 and Venture Star be MK 4

or have MK 4 be a hybrid between both

[blazing ibex]

I feel like this would be better

mk5 should be more of a spaceship than a spaceplane in my opinion

[blazing river]

fair nuff

[runic crystal]

thats not KSPIE

KSPIE doesnt have a 1 part SSTO, diff mod