The attached sketchup file is all set out in layers so each part can be turned on or off. (File removed by admin)
A few notes:
The framing is all at 610mm centres, but I'm fairly sure should be at 600mm or 450mm.
Its been done in 50 x 75mm timber for all the framing, 18mm ply for the floor, 18mm OSB for the interior walls, 11mm OSB for the ceiling and roof.


I can provide more pics if needed!
Thanks a bundle
EDIT: First post here. Moving to a new house on a farm soon with loads of space, so can finally have some room do explore woodworking!