Looking good, you'll have to keep her misnomer :lol:
I have 2 suggestions (and they are both polite). Heaters are best on their side but it isn't vital if you have good water flow. Either lie the heater on its side almost touching the gravel or stand it upright in one corner, or the end that isn't seen from the other side.
As for the spray bar, if you put a strip of duct tape or similar (as wide as you can get) around the top of the tank (2 widths if necessary), then fill the tank so the water is a bit above the tape and the spray bar is also behind the tape.
I'm not sure what the tape is actually called but it goes on sale regularly at Mitre 10 and is a sort of material, rather than the plastic of duct tape. Also comes in a variety of colours. I have silver on mine but I have seen tanks lined around the top with black and blue tapes.