Well, your router looks different from what they show on their website at this moment. If those are 10mm smooth rods, there will be quite a lot of flex. Also, Nema17 in the 0.3Nm range I suppose, will have a hard time pushing it around. But like I said, since you are half-way through already, you will have to mount it even just to check how well/bad your axes coop with the Kress weight.