Jonathan. I have been curious about this also. If you go back through the forum topics, you will find an old one that has several people giving their dimensions. I measured ours today to be 25 3/16″ from the forward face of the mast to the aft face of the V-berth bulkhead. I have been inclined to move the mast butt forward and based on the measurements in the old topic, I will likely move it forward about 1″. However, that will probably not be till later on this summer.
I played with my mast base a bit, and found that the furthest forward position (I forget the actual measurement) gave me quite a bit of weather-helm with my stock rudder. It might work well with the elliptical. I ended up moving mine back about an inch from max forward. I do not have the measurement handy.
My mast step is…. well wherever I want to put it. I have ripped the old one out, have rebuilt the stringers in mahogany and am replacing the rotted out mahogany step with an Aluminum girder. The new step will have a bit less then an inch each way. So looking for a good neutral position.