However, the current metal texture is just to big (you can see the grates) and thus I can’t use it unless there is a way I can shrink it down to a usable size? Anyone perhaps know?
In the Material settings, on the Map Input tab for your texture, you will see fields for SizeX, SizeY, and SizeZ. Increasing these numbers will reduce size of your texture by making it tile by the amounts you enter. Try setting all of the Sizes to 8 or 10 and see what result you get.