My wife wanted to be able to have chairs on the ends so I extended the top by 14" over the frame. We also wanted to be able to cover the gutter so we used $10 plastic planter boxes and I cut a 2x6 to drop into the gap. There is a 2" hole towards the center to be able to pull the lids off. We did the entire thing in cedar, then finished in linseed oil. Since this will be out in the elements, we wanted to prolong its life. :)
$250 including lumber, planter boxes and weather resistant screws
Made out of cedar instead of fir
Extended the table top for additional seating
Change gutter to planter boxes
8 2x6s at 8'
8 2x4s at 8'