my main reason for not wanting to use concrete in the rails is because im used to the way it does it in vanilla, and i never make concrete until really late game, i have also swapped out the steel in your wood rails for raw wood, i suppose i could keep the crushed stone wouldn't make much of a difference really just another step, but its about immersion, and i made oil low on this map because i plan to use bio plastics and see i can make bio batteries too, so looking forward to doing that, with the option to use bio sulfer for use in nuclear power too makes the hunt for iron and copper more important than crude or coal, still gona need that stone too.
as for the graphics the new (seed/seedling) green house looks really cool never had any issues with the bigger dome, but was planing to use lights and stone, now it needs the mini green houses and bricks, well alrighty then lets change a few things here, must replan, still fun tho.
the addition of the solar floors is also a really good idea too, run faster and power the base from under the buildings too, it sounds a bit weird i know, but since we can't build the solars on the roof, guess we'll put them on the floor, lol - this feature is my new fav of this mod. previously being able to plant new trees was, especially around those heavily polluting mines, that makes the biters so angry/hungry.
i am not a graphics guy, but im glad that you are open to the possibility of better graphics and that you have friends/helpers to provide some for new features
as for the wooden pipe, i could add it to the tech tree via a research very simply, but as i had no desire to use it at all i simply turned it off and no way to turn it back on, i read someone else wanted to have this as well so thought that would be a good option. dont want it, dont research it.... but yeah dont like it dont build it works too i guess
also i changed the huge accumulator to be exactly 100x the regular accumulator, smaller footprint and still takes 100 regular accumulators, 200 raw wood and 50 copper cables, as i dont like concrete, lol thought about skipping the step of making regular accumulators and have the huge accumulator eat batteries directly save some iron plate and a step, but not that big of a deal really.
the huge solar dishes also is 100x the solars with 400 raw wood and 25 small electric poles, must use all the wood!
anyways thats just some of my thoughts, and some of the changes i made for my play through