Well Brad, you said it. A picture of some kind might help us to come up with some ideas. A sketch would be great. I take it that you want a desk of some sort in your easy chair to write on and also to hold your computer?
On a different subject, if you are looking for hobbies or something to stretch your brain, I might suggest learning to woodcarve. I got into that while we were out on the road and I needed a hobby that didn't take up any room and didn't add any weight to the fifth wheel. Also, I have gotten interested in micro-electronics. Do a google search on "arduino". It's really interesting and if you have any electrical knowledge at all, it's something that you can build on and learn how to do some programming at the same time. Not too much of an investment either. I have read a ton and watched a lot of videos on the subject. Also, do a search on "instructables". There are tons of things on there that you can make and do. The key here is to keep your brain working and learning. I'm 75 and I know that there is still a whole world of stuff for me to learn. The trick then becomes how to merge all the hobbies into one. I'm working on that.