I think it's not sensful to say "He got spiderlegs and can move over/through evrything friendly". If you try to move through Building's, Cars, Tanks, Trains or Biters in Behemoth-size you will collide with them. Smaler things like robot arms will be instantly sqashed. Maybe Big Biters could be too ...

I know, this MUST be an old idea and maybe it's deprecated but here a "little" idea to implement a new user-device like the car or the tank:

An atomar powered (big or maybe huge) walking robot like the immortals in StarCraft2. Four legs and a rotating body in top of them.

I think I got some points ...

miniature trains (Werksbahn):

I egree with this idea. At first, I like to use "clean" transportways with only one type of item. The most time ather building some well structurated configurations, I need to redesigne them in later stages of research. I start to integrate "whitespaces" to avoid this ...

Nuclear Power sounds realy funny!

I confirm to the thinking about puttig in a boiler is to simple but I also think the usage of it should't releas the circuit of steampowered energy (at first).
Here is my Idea to use uranium:


At first, the buildings could need to be powered electrical cause of ...