Yeah I agree it is a bad idea, not to mention difficult. As someone who tries to cross pollinate software it never works as well as something built natively.
Layout just needs to be reconsidered by people who know what good documentation requires and some serious programming resources put on it for a year or two.
If layout worked as well as standard CAD packages it will literally take over small architectural practices. Sketchup is the most popular software at all the architecture universities in my country so grads are coming out fluent in it. The majority of local architects I know love it and use it during the design phase, but abandon it for other CAD packages during development, most of which are far more expensive than Sketchup pro.
Make Sketchup / Layout as efficient for producing construction documentation for an equivalent price and it’s no contest.
I just hope Trimble can see the gold mine they are sitting on.