I think tall head tube is not a reason why this frame looks aesthetically strange.
This strange (or what stevec1975 calls ridiculous) look comes from connection point, of top and head tubes, sitting too low.
If top tube is connected to the head tube at the very top, this frame will look really good. It would mean that all "Tall Head Tube" Parlee frames will have more slope than "Normal Head Tube" frames and to me that would look far more aesthetically pleasing.
I understand why some people need taller head tube I just don't know why Parlee chose to do it this way.
Just think about the production of the range.... So we know they are semi mono in construction not full.. The frames are joined in the main trangle with the front and rear halves of the bike molded in single pieces, so... To make the frames the way you deem sensible you'll need each std and tall frame set to have its own mold, where as parlee has simply made new front triangle molds for the tall options.. Money and streamlineing of the production line are the very sensible reasons parlee has done things this way.. A small frame with a tall head tube is always gona look less than ideal that's just a fact..
3delis it's a great build! You could sneak it under 6kgs with lighter peddles, cables and a couple of small part changes! My next bike is gona be an small parlee z5sli, got a fit last week that green lights a smaller frame! Good work