Hi Anthony -
Unfortunately I do not have good news for you here with this question. There is no way to rename the Element 0, Element 1. However, if you open your static mesh in the Static Mesh Editor window (Double Click your mesh in the Content Browser) You can Highlight the polygons which use that particular element and then assign your material in this window. After assigning, when you drag that mesh into the world from the content browser, it will already have the materials applied.
One clarification about what you posted above as well. To correctly align the materials from Sketchup to UE4, you will want to set the values not necessarily to 1000mmx1000mm but 1/2 the size of your model by 1/2 the size of your model. So for instance if you drew a 4000mm x 4000mm then the material in Sketchup would be set to 2000mm x 2000mm
I wanted to make sure that was clear
Good Luck, let us see some of your work when its all done, we would love to see how it comes out
Ketchum