Really nice frame and high end mixte's this size are pretty rare. Not a great price but within reason if it's something you really want and your not likely to come across another mixte frame set of this size and quality any time soon. Libertas made quit a few nice large step through bikes so not super rare just most were sold in Europe so it is pretty rare for one to pop up in this condition in the US as frame set. I think this bike would build up very nicely with IGH. I don't see any issues with the build your planning for it.