Size is not the only thing that matters
Hi,
As JT says, it is a bit complex and distance is not the only issue.
I have a paper on the topic I'd be happy to share under some conditions. I've also a couple of associates who could assist. PM me.
A word of advice, from much experience: consultants only appear costly until you start working on an aviation project and have to call one or more in to "fix it". I work mainly on airside operations and procedures and professionally prefer to do this before people start laying concrete and asphalt: the bank manager prefers that I only start work when the batching plant is in place and the layout is set (literally) in concrete.
And as my grandfather used to say, "You can not demand quality when you have not paid for it."
MJG