TL;DR
As an addition to increased recipe cost option...Why?
Idea is, that assembling 200 assemblers/reactors/raffineries in one little factory is silly.Building it in advance to chest, for later use - is silly too, and also impractical - Who build "reactor factory" to build few reactors ever?
Most build it in inventory anyway...
What?
New option at game start:[ ] No building assembling/crafting
How about You can only place manually "foundations" for building (9-15 tiles of concrete/bricks/new kind of bricks designed as foundations)? Then You place building ghost on it. Now, You can either manually (according to game settings?) or with bots (I hope for new slow ground bots for that for early game) insert required materials (according to recipe costs) into that ghost. You can place ghost first, then build foundations, so bots would not start until You are ready. Then, You can watch progress of constructions from foundations, through scaffolding raising up (2-3 steps), then building appearing (2-3 steps).
Let it take as long, as building recipe specifies, with pauses if materials is not delivered on time.
If You deconstruct building, it's converted to its original materials (instantly, or in reverse process sa above).
You can also demolish it quicker with tank/pickaxe and get SOME of materials back.
So, for example, if You want to build Nuclear plant, You do not need to build reactors/centrifuges earlier.
You gather required materials in chest or car, or build temporary rail line to construction site. You send trains with required supplies and bots builds it for You.