The "old" parts need an art overhaul.

[Steambirds]

Although I love the dirty industrial look of the 2.5 m parts, they're ugly as heck and really do not fit in well with each other or the other parts. A giant orange tank next to the regular 1.25 m parts can be quite jarring.

[prophet_01]

Yeah the 2.5 m tanks rly look a bit outdated. However if an overhaul gets done, I definetly want the orange tank to keep it's color, even if it sometimes look a little strange (it's iconic).

I'm mostly fine with the 1.25 m tank's look. Maybe the 400 could need a small change. But I can't rly mske up my mind on that as it looks low tech without, but not that crappy. It fits quite nicely into the barn-age atm.

While we are at it, the oscar-bravo doesn't look good imo and is not performing that good in many situations. Imo it has been in need of a redesign for quite some time now.

[Wahgineer]

I think most people know that there can't be fire in Space

Then what the heck do you think is shooting out of the bottom of the engine? Why, then, do they think they bring oxidizer? For laughs? NO. They Bring oxidizer in order to keep the engine running, and as a result of combining oxygen, fuel, and heat (the fire triangle) you get FIRE. LOTS and LOTS of FIRE. You can have fire anywhere as long as you have oxygen, even in space.

[Tuareg]

Then what the heck do you think is shooting out of the bottom of the engine? Why, then, do they think they bring oxidizer? For laughs? NO. They Bring oxidizer in order to keep the engine running, and as a result of combining oxygen, fuel, and heat (the fire triangle) you get FIRE. LOTS and LOTS of FIRE. You can have fire anywhere as long as you have oxygen, even in space.

Is there fire inside you? Or is that a chemical reaction with generating heat? Not every oxigen+fuel+heat called fire. its called oxidisation... Hot gases leaving the rocketengines, not fire.

[sarbian]

Oooh, the smoke-ground collision seems promising! Also, the expanding exhaust is something I've wanted for a while, but haven't found any mod for it.

I suggest you search a bit more because there is a mod and a bunch of config that does that.