Hello!
Off to a good start. Once you get past the tracks, it gets a lot more interesting. About the interior - please re-think that with the scratchbuilding. I tried it once, and it can be done - but I didn't make it. It's more complicated, than it looks like. Here's how far I got:
The real trouble is the area around the emergency exit hatches, and the crew stations, and the ramp opening mechanism. Buying the resin kit in the end isnt much more expensive than, say, doing the floor in PE metal, but saves you a lot of life. The HF resin kit still has places that leave some room for improvement, like, say, the fire extinguishers.
Good luck with your projects, have a nice day
Paweł