Framing advice

[Jupiter01]

...and this idea of building the walls on the ground and then lifting into position, only works if the base is absolutely level and the house wall is dead plumb? I doubt either are...
I've got my base as level as I can. I think that's good but unless the wall is at 90 degrees from the base, it might be safer to build the timber walls on the base?

 

[freddiemercurystwin]

Either way that works, of course if your house walls are on the pee then the panels need to take account of that, your base should be level in anycase.