Hi Mark, attached is a 3DM file of the kind of thing I'm talking about - here you would do a Loft (Loft Style: Normal seems to match your top side curve good) with these taller profile pieces to make that upper part along with the lower part all in one Loft rather than as separate pieces.

It's ok to have a kink in the profiles, but it is also good in that case to make sure that each profile is made up of the same number of segments, so I split a couple of the back upper parts to make a segment arrangement that kind of continues those strips throughout the loft.

When you do a loft in one go like this with kinks in the profiles, the generated pieces will all be sure to touch each other.

So that would solve your problem of having gaps between pieces anyway...

- Michael