> Having folks who are untrained in law draft a constitution and then passing it sounds... well about as dumb as [...]

Does it? Laws, or more general, contracts are made between people. If the wording of those laws/contracts requires a special education to be understood, people don't understand the contracts they make anymore. But then, what's a contract worth if none of the parties involved understands it but they all have implicit expectations?

Shouldn't a constitution be understood by every citizen? Let lawyers point out potential ambiguities, but let regular people do the wording so that regular people can understand it.