the guy from xacd Porter can be pushy and a bit rude, but that is often how they are over there,,
they draw up your ideas and ask you to sign off the drawing, dont let them pressure you , get it right, i am very fussy about little bits like cable stops etc,,
i nust have gone through about 5 drawing versions before i was totaly happy,, they guy (or gal) who does the drawing is on the ball and understands more than Porter often i would draw up a change and porter would not understand and require some clarification but before i had a chance to reply a new correct drawing would arrive
my bike was more expensive than most from there as my dropout design was expensive to produce and there is an upcharge for all those bent tubes but thats what i wanted