Couldn't reach the reverse lever of the quaife box on the orange car, so just in case others are built the same you may wish to know that with a little work the lever can be moved to the rear of the quaife box, and so much nearer the driver.
If anyone needs details U2U me with a telephone number, or if you can figure it out yourself, use the bolt holes on the top of the box, drill a hole in the shaft of the gearbox and bolt to the slot in the gear change lever.
No idea if this is any help to anyone but may be worth filing for reference!
Ed