So this is what's been answered:
1/ If I'm using sub base do I put that on top of the top soil, or do I remove the top soil first?
r896neo says its to be removed
2/ What substrate? Is there anything cheaper that MOT1? Maybe just plain non clay soil?
It needs to be MOT1 so it can be compacted
3/ Do I then replace the top soil on top of the sub base?
Nope
4/ How thick should each layer be before I compact it?
No answer yet
5/ Do I pay to dispose of my top soil?
No answer yet. I just recall someone saying that top soil is expensive.
1/ If I'm using sub base do I put that on top of the top soil, or do I remove the top soil first?
r896neo says its to be removed
2/ What substrate? Is there anything cheaper that MOT1? Maybe just plain non clay soil?
It needs to be MOT1 so it can be compacted
3/ Do I then replace the top soil on top of the sub base?
Nope
4/ How thick should each layer be before I compact it?
No answer yet
5/ Do I pay to dispose of my top soil?
No answer yet. I just recall someone saying that top soil is expensive.