I Can't Find What Fits Here

Really wish there was a 'guess best fit' option somewhere when building a hull. I've got a spot where I'm trying to blend a slope and it feels like I've tried every armor piece in every configuration and none of them fit.

I have an OK mental image of what I want the hull to look like and it's actually helping with the choice-paralysis from my prior post however I can't hold a few dozen different mental images in my head at once to fit the puzzle pieces together in a timely manner. What fits in the game shown?

To zoom out a bit: the idea I had for the Hull was to have a cockpit on a protrusion and have it enlarge in a segment or two before more-or-less flattening out on a wider body. I'm trying to make the slope for one of the first columns of it widening and need this mystery block.

Edit: Adjusted the overall shape of the build to avoid needing this part... I think it looks better now too. Making good progress and came up with a name for it. I may post a download link to the Voxel Lance v1 sometime soon.