Have you thought about a E3D hotend? If you regularly print ABS is might be an option. Then you don't have to design parts and it has a verity of nozzle sizes. There are already some mounts designed for the um1. If I am not mistaken the axis are the same between um1 and 2 (correct me if I am wrong). You might loose some printer hight since the um2 head is quite compact. Compared against the um1 the latest design is comparable to the original print head I think you even gain a couple of mm in height.
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eldrick 65
You may want a copper alloy, as pure copper is pretty soft.
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