http://westfieldmx5.devocht.com/pictures/the-oil-pan/
I will be modding mine as per the link. It will leave the sump at the same level as the bell housing. The bell housing will sit approx 10mm below the bottom chassis rail.
As I will be fitting an oil cooler I am not worried about the 1/2 litre or so capacity I will lose. If you are you could fit a larger oil filter?