Hi Roxyguy,
Are you happy with the roundie-roundie design and just want to finish to off, or ideally you'd like something different in time even if confined by the spare bedroom or wherever the layout is now. if you can't go out, you could go up. What you have looks good and most of the pieces could be reused in modified layout. A multilevel layout might be possible for you, even in this space and would add some additional room, variety and more fun. Set some longer term goals maybe? Are you on DCC?