Sounds like you're pondering something that's exactly the opposite of Touratech's business model. They supply expensive aftermarket parts intended to improve a bikes ability to cope with the rigors of touring or overlanding but only a small percentage of them are actually used as intended. As such (I'd guess) most purchasers are happy with the way the bits perform as they never get tested to the limit.
You're proposing putting together bikes that actually will get to be pushed to their limits and you're going to have to source any add on bits as cheaply as possible to keep the prep costs within bounds. That way lies loads of complaints.
It's one thing if your diy rack / panniers snaps in the middle of Mongolia, taking the subframe with it, that's down to your faulty welding and maybe you should finish the evening classes next time, but if it came from TedCo Overlanding Prep Ltd you're going to have to make sure it's strong enough to cope with being winched out of a river in the Congo.
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