I guess it really depends on your setup as I wanted the hoses outside even before with the original Grobo. I find it simple and my hoses run around the back of the Grobo 2 and I fill and empty from the opposite right side. Plenty long enough, bucket right by the rear right corner. Or just dont pull them out the back and run the out the front same as the original. You dont have to run them out the back, leave inside and open the door during the drain/fills.
I am not sure you need a 2nd fan as I am thinking it might even be too much, looking for ways to lower the speed if I could like some fans do? The single fan in the Grobo 2 is about 10x better than the 2 in the original one.