4882 Sky reckoner
One of the challenges with alternate models is getting the dimensions right. You only have a limited set of pieces so you have to make the right choices to make things fit and work, else you have to take things apart and restructure everything. The odd thing about this model is that I did not have the dimensions well in my head when I started but it all managed to fit exactly where I needed something. I mainly went from fitting in the parts I needed and shifted parts if there was nothing else available. Several times I had an open slot I needed to fill and there was exactly the part I needed available for it to do the job. That does not mean this model is perfect. There are several notable weaknesses but they do not disturb the look and feel much. In the general display the design will look quite cool. The guns are just an extra as I did not have the parts left to fill up the sideways studs, but they look like a nice addition.
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