Scoob
I did say the Honda seats were $xxxy so no surprise there.
I've uploaded pictures here to show you the modficiations I made to my MX5 seats to get better room and adjustment into my G Force. These also show you the skeleton of these seats and how simple they are to play with compared to other options.
I narrowed the width of my seats by 50mm to enable me to get them further back into the G Force cockpit. You may not need to do this with your kit though. And as I'm not a large butt boy the thinning of the seat width hasn't affected the seating comfort for me.
Seat pan and spot welding on 50mm overlap. I simply overlapped each edge and aligned the two sets of parallel holes now seen as one in this picture and had each edge spot welded. The seat cushion was simply cut down to refit into the narrowed pan. This also allowed me to rejuvinate the steelwork, as these seats do suffer from rust and are uncoated in the standard form.
Total seat frame skeleton after narrowing.
The rear - back frame has a solid bar across the bottom and support plate part way up. I simply cut out the gap in the bar but did insert a stiffener into the tube for rejoining and like the seat pan just cut and overlapped the support plate and rewelded.
Retrimmed finished product
The critical issue first is whether the MX5 seats meet the SA ADR's being pushed, if so I can attest to these seats being very comfortable and even in standard form are one of the smallest production seats around.
If I had to do this again I'd have a look at the seats from a number of small cars including those smart cars, some of the older suzukis including the mighty-tiny boy, cappuccino and other variants.
The work above all up including seats cost me $1000. But am sure a standard set of MX5 seats in non leather might only be about $400 for a pair.
Choose wisely though if you are on budget constraints and hope this helps.
Have fun!