Looks great, what a discovery If you need some more details, there is a review of an Overbury's Pioneer in MBUK Volume 1. issue No. 3. I only remember this as it was the first MBUK I read, and the bike was tested against a Saracen Trekker ( the bike I was eventually ended up riding). Think the Pioneer in the test had the same Exage Mountain components, U-brakes might possibly have featured tho'. Enjoy the restoration.