The frame is fixed and work has started. When assembling the cylinders there are a few things to remember; The arrow on the pistons has to point towards the exhaust pipes. When you place the circlip in the pistons, place the one towards the center of the engine first, it’s next to impossible otherwise. When tightening the screws on the cylinder heads it’s important to tighten them diagonally, otherwise there’s a risk of damaging them.