Don’t stress too much I too had some difficulties with this area of the build as well. So many pieces all coming together at odd angles.
I’m not entirely sure what step in the build you are on but I assume its the fitting of the quarter panels.
First thing I would recommend is to address this gap seen in your picture below. Was this seam already glassed because it looks like epoxy on that edge? If so it may not bee too much of an issue, you will be cutting along this seam to create the galley hatch. If it wasn’t glassed you can add a stitch back in to tighten up that gap for now.
Next add an additional stitch point seen here in blue
You can remove both of these stitches after you have the quarter panels secured to the galley flat.
Now that those gaps are tightened up you can secure the galley flat.
Finally once the galley flat is in place and you are on step/page 95 of the manual you can do what I did that worked well to ensure proper alignment. When filleting the quarter panels in place I had temporarily stitched the quarter panels AND transom panel together. Then once the epoxy set up on the quarter panels i clipped the stitches and removed the transom knowing it would fit perfectly later on down the road.
Hope this helps.