steel shop trusses

has anyone built there own shop and built the metal trusses?...i need some ideas im building it! its goin to be for now 25LX30W. so i need the cheapest way and metal truses are the cheapest way to have a 30 span with no post in the middle

i dont know what the building codes are there in florida but theres big fines/possibility of having to tear it down if a building inspector finds out about something youre building even as small as a deck, anything that supports a load is supposed to be engineered and designed specifically for that building. not saying youre not capable of building it correctly but engineers have there job for a reason.