I have recently started to build a model slipway tamar class lifeboat and when marking out the holes for the bow thruster I noticed that the lower spray rails were not symetrical and that the front 220mm of the port side needed building up gradually from 0 to 5mm and back to 0 in order to correct the problem. I only noticed this because I printed two bow thruster position patterns instead of using the one supplied in the booklet and when used together showed up the problem. Not to difficult to resolve, but hope this might be useful to other tammar builders. If anyone has any other hints or tips for making this boat I would be most grateful👍