First, if you have not installed the wall sheating you should be able to force your framing back to square with the use of tempory bracing.Bracing should be used to keep framing square and plumb.It should be install on the interior as to allow the wall sheathing to be installed with bracing in place.I suggest plywood sheathing at least on all corners. This helps keep the framing square and plumb. Do not remove any bracing until all wall sheathing,trusses and roof sheathing have been installed.This is very important as the structure could collapse with out it.Also the trusses will need to be cross braced as they go up.
Building anything without planning is foolish.
For a gable end to gable end installation on 16" spacing you would need 34 trusses, 2 of which would be the gables. If your roof-line has hip ends or will be incorporated into an existing structure there will be more trusses.
There are many ways in which one can purchase a garage building. Most garage building are built within a house or complex and are purchased from house builders. However, unattached garages can be bought from garage salesman.
Garage
In the U.S. it would be a garage.
You do not need a building permit if changing the interior of the garage. If you are using heavy machine equipment and moving large lumber on the outside of the garage to make changes then a building permit is required.
Depending on where the garage is to be constructed, building permits may be required. There may be zoning restrictions about the use of the garage, the footprint of the garage, the materials, design, etc. The planning phase must include all of these considerations.
A parking "building" is similar to a parking garage, in which a number of floors are connected by ramps which can be driven on in an automobile to find parking. the difference between a garage and a building is that a building is generally completely closed in on most floors.
It will vary depending on where you are but generally if the garage is not attached to the home, you do not have to sheet rock it.
There are several real life examples of a trapezoid that can be found every day. Some are women's handbags, metal garage buildings, and the trusses of a bridge.
The noun 'garage' is a singular, common, concrete noun; a word for a building used to shelter or repair motor vehicles; a word for a thing.The word 'garage' is also a verb: garage, garages, garaging, garaged.
A thing starting with G is garage.