If you are interested, I made such a pack recently:
Inspired from Reality Intermediate System (IRIS): "SFS hard mode"
The scale is still reduced by a factor 4, to simulate more accurately the level of difficulty you would encounter in real life. I can't add SRBs however, this would imply to modify the game itself.
Some "RSS" (Real Solar System) mods also exist (in scale 1:1), you'll find them in the download section, but they are extremely difficult in practice, because engines in SFS are way less efficient compared to their real life counterpart.