TheElt

That's all I can push from that design, changing the wheel mounts to the small cubes and struts gained me about 5m/s, little bits here and there that you can cut out make all the difference, but a Mainsail is the way to go for this I would drop it down to only 2 wings which could possibly push me near 400m/s, but then stopping is a huge issue and it's pretty unstable at times with 4 of them

Then Starwhip's submission is invalid, he used SRB's to slow himself down and the ASAS included in the command pod to keep himself steady I'll bite, anyway. End speed of 383m/s

I managed to get it to work, the log was saying the scenario was too old to work with 0.21.1, changed the config file to 0.21.1 and it worked, just the gates like to float away when the physics load. Either way it's a damn good course, challenging too. My best time was 9 mins in my slowest plane learning the track (Plane gets twitchy past 100m/s, so I have to keep it at about 90m/s. But it can land/takeoff on water!).

I can't get the scenario to work, it just won't appear in the list.

Welp, since I'm no longer on the leaderboard I re-submit my craft, the X-9000 Top speed reached; 2,263m/s I need to have another go at this, I can go faster.

Is there any way of editing the default part textures in KSP? I have tried This and it didn't work. Apart from that is there any other way of doing it? I tired an MBM editor and the images were a Siemens F1 car with dodgy colours.