That's the beauty of remapping. We all have our preference and can fulfill them as long as the layout you have supports it!
Now for the space between ctrl and alt, it's not possible as far as I know, but I don't know that much. Still, since I know no IBM keyboard of that time or a few years later with a key between ctrl and alt, there's little to no chance they put one there "in case". So you probably have to use another key to remap for it. Personally I don't really use the right ctrl/alt so if you are like me you could use one of them as windows key. Of you could map it in a layer. I use the capslock as a function key and LOVE IT and I use it to have all my navigation keys on the ijkl region. If you try something like that you could plug 1 key around there to use as a media key when on a function layer. I like using the capslock key for fonction layer since I never use capslock and I don't have to lift my hands to use it, it's just right there and so very easy to use.
In the end, you have to determine how best you want to use your keyboard. We all use it differently to some extent. The beauty of it is that it's super easy to experiment. Just modify the .hex, load it, try it and keep it or try again!