To be honest I wouldn't bother with mainlining.Looking cool but requires more time,mixed technics will also shape them nice and probably faster.....I have few started like that(not on purpose,i had to cut clones)but I prefer to just LST,super crop or whatever I decide in the moment,it doesn't have to be so symmetrical......Last pic is not started like that but also cute Blue dream-humbold.
morugawelder:You could clean some more things(lower small branches may be) but it looks very nice now!:)Cut by feeling or you can just leave it like that:)Other thing you can do is spread the branches a little more,put the bigger leaves under the tops.....May be I would cut off some bigger leaves but I don't know,I like it now without too much interruption:)May be you can take them off last weeks of flowering,before you chop......