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However, the last one I built is pretty big. With a wingspan of 196 studs and a legnth of 170 it's the biggest single model that I ever built. It was about three years in the planning. Buying parts took a long time, but it also took me a long time to find the time to build it and the confidence that I could do. I didn't want to start this and fail.
So, here goes: my B-52. It's built to a scale of 1/36, like most of my other aircraft and helicopter models. The B-52H I decided to model is 61-0062, nicknamed 'Cajun Fear', in the markings it wore around 2001, when it was assigned to the 20th Bomb Squadron, 2nd Bomb Wing at Barksdale AFB in Louisiana. (The aircraft currently still serves with the 2nd BW, but with the 96th BS.)
B-52H Stratofortress (1) by Mad physicist, on Flickr
The shape wasn't particularly easy, but the main challenge in this project was the sheer size, in particular of the wings. The wing carry-through structure is a very complicated piece of kit. I took great care to make it as strong as possible and also took great care when mounting it in the fuselage. Because the wings are swept back so much, most of the weight (including that of the engines) is located behind the carry through structure, which could easily cause the whole thing to be ripped from the fuselage. So far it is holding up really well. The outrigger wheels don't even touch the ground.
B-52H Stratofortress (8) by Mad physicist, on Flickr
In the 'seventies, the B-52 was slated for replacement with a new supersonic bomber, the B-1A. The latter was cancelled, but resurrected as the B-1B in the 'eighties. B-1Bs never did replace all the B-52s though, and they currently both serve with the USAF. Until I completed the B-52 model, the B-1B was the largest model in my collection. They're both built at the same scale and the B-52 isn't much longer than the B-1B. The difference is only 16 studs. It does have a much taller fuselage, however, and much larger wings.
USAF heavy bombers (1) by Mad physicist, on Flickr
It's hard to convey the size of the model in photographs, but perhaps putting a few objects next it will help: a minifig, a standard 2x4 brick and a CD.
B-52H Stratofortress (26) by Mad physicist, on Flickr
Then again, perhaps swooshing it (or, more accurately, heaving it into the air) gives you a better impression. The picture also shows the undercarriage (which is retractable), the internal weapons bay and the 12 JDAM bombs it carries under the wings.
Swoosh! by Mad physicist, on Flickr
Cheers,
Ralph
It's on the frontpage. 
