Can't help thinking we are all missing the point here. If you want to get to Scotland in something cheap and reliable, with limited scope for adventure and inconvenience... and if you are trying to avoid any experiences that you can tell your grandchildren about, just hire something sensible.
BUT NO! You are 18 or so, you originally wanted to live the (OK, daft) dream of touring Scotland in a Series Landy.. so DO IT! When I was your age (alright, it was in the early 70s), a mate, an enormous dog and I toured Scotland in a 1955 Series One (NFS 103, ran it on paraffin once the engine was warmed up - smelled like a Boeing 747) and camped in an old RAF cargo parachute draped over the back of the tilt - heads against the mid bulkhead, feet overhanging the tailboard, dog kipping wherever he liked and farting like a trumpet. We lived on beans, plus fish we caught and rabbits we shot with a 22 air rifle. Landy broke down several times, we got the squitters, we got soaked, it cost a bloody fortune and we got arrested in Ullapool for trying to prove our sobriety by walking a straight line - the one in the middle of the road.
Would I do it again? - absolutely not, cos I'm 55, I'm relatively sensible and I can afford to travel and live in a degree of comfort. Would I recommend it to a bunch of 18-year olds? Too bloody right I would! It's a stupid, ill-conceived, but FANTASTIC idea and you'll look back on all the disasters, discomfort, breakdowns and hangovers with a contented smile one day when you are too old, knackered and sensible to consider doing anything so wonderful ever again.
Just a thought.