I have two kids . . . one is 6'4" and the other is 6'2 and still growing. When he was 10 he went in a 911 and said is was the most uncomfortable car he has ever had the pleasure of being in the back of.
Take Ekona, he's going on a jolly round Europe for a week or so, just him (don't think the mrs is going) and he's taking the back seats out . . dont think thats to save weight
In this situation you buy a second Zed and convoy everywhere
To be honest it's only because my wife actually got into and came out in my zed today for the first time ever, told her I deserve a newer version, I have a 13year old boy who is a joint owner "yup true" so it's ours,,, She then went on about how we could not go out as a family and that she would be happy in the back seats etc.
Kept closing her eyes every time I gave it some beans, I'm sooo cruel, but how can you resist when your on an airfield road lol.
Hmmm I can see her point, but I can't think of anything along the lines of the Zed with a proper back seat, especially something your son would like. I was thinking an XK Jaaaag, but it's a different beast to the Zed and your son probably wont be too interested.
Does it have to be something newer and lower mileage than the Zed?