For sure going back to the original is the easiest. It is all a matter of what you want tempered with what you can pay for. There is only so much you can do in such a small space. One thing I saw once that would really be nice was a guy removed the double bed and put in a sort of work space with a desk that looked out the curbside window. It was done very professionally and looked great. We have three kids, so that wouldn't work for us, but it was cool. You could also remove the goucho and put in a nice functional L shaped dinette. There are lots of resto threads here that show that kind of set up. Keep weight and, more importantly, balance. Have fun!
Work is never done, so take time to play!