I am thinking of buying a Trek CrossRip or 720 touring bike, but I want it with Ultegra Di2 and the bikes are only listed on the Trek website with lower-end components. So I'd like to buy a frameset and build it up the way I want...but how? I don't live in the US and the official Trek LBS I've been to is outrageously expensive for everything, so ideally I'd want to buy online. The Trek 720 is a brand new model so finding a used one in the right size seems very unlikely.
Some brands list framesets on their websites separately, including Trek, but the particular frames I'd want aren't listed this way.