I looks like you're putting the cart before the horse, or else your chicken-or-egging.
If its the latter, then I'm surprised to hear you've already chosen your main contractor.
If you're willing ot place yourself in a hands of a builder, it should be someone who has experience of the system you choose.
So. first you consider all the issues before appointing the builder - then you chose a builder that has practical experience of the system you choose.
I say this because having recently researched timber frame suppliers for a client, I found that few of the builders contacted were familiar with the construction - or claimed not to be.
Of course you could following the common sense route and retain the services of someone who by training and practice is competent to advice on all things in relation to building - an architect.
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.