Tweaked some configs to bring the small grid in line with certain expectations.

Small grid model changed from 1x1x1 cargo container to small grid hydrogen engine. I thought it fit better.
I know this will cause some issues with some ships, sorry for that. I'm not planning on further drastic changes at this point to this mod.

Fixed some text.
Attempted to unify with my other mods into the SCR category.

Added thumbnail.
Updated description.

Made both blocks air tight.

Added description and build req's.