The 42 came with a Sunbrella seat cover for the dual helm seat.  I liked the look of it so I decided to copy it.  Here it is on Sojourn.  Just a simple shaped bag really, with a drawstring at the base to tighten it up.

 

I set about to make a rudimentary pattern - doesn't have to be exact at all, just a sun-shield anyway.  This is the original turned inside-out so I could get a feel of how it's constructed. 

I didn't have any tracing paper, so I just used what I had on hand - printer paper - to make a pattern.

 Got out the handy electric hot knife to cut the pieces to a more manageable size off the roll.

Transferred the pattern over to the blue Sunbrella.

 

 The two "end caps".  The remaining piece was just one long rectangle to be sewed between these two pieces.

 

I used  clips instead of pins - worked wonderfully!!!  So much easier than sticking pins thru the tough Sunbrella material.

 

 I won't bore you with details of the sewing - just easy straight stitching and a simple drawstring pocked that the base.  I'm pleased with the result.