Model Railway Turntable - in a spin so much Im dizzy

Ive seen that whilst ive been away there has been some discussion on how my project isnt practically possible.
Nevertheless, ive come this far and wont be deterred.
Ive said numerous times that the size of the scale im working in is a problem in itself. so im aware of this.
Ive also said before that i haven't laid any rails as yet. I havent done so on purpose so that i can lay them so that the trains can be tested thoroughly before i do so to ensure there are no derailments.
The reason i need to be able to tweak the locations in the programming is so that if there are any rail movements due to heat/cold etc this can be combated.
Once the programming works and is user friendly for my autistic son, i will lay this area of his layout, but, i will achieve this for him. As i said at the start i have committed to this.
Im also sure ive said before that i needed something small to fit, but that i was not constrained to any particular components. in fact i have purchased a number of them already following discussions in this chat.
Im hoping its just that im tired and have misinterpreted the nature of these messages, which is what i will assume. But i did want to clarify some matters before calling it a night. I hope this doesnt cause any offense and i wish you all a good night.