exterior stainless chimney question

guys, im planning on putting a wood burning furnace in my garage...thats where my furnace is located, so i would have to put in about 25ft of exterior 6" chimney pipe in the rear of my house..i have a wood burning insert in the fireplace venting to the chimney on the opposite side of the house...the problem is its a raised ranch...so i would have to come out about ground level with the pipe out of the garage, then go up about 3 ft, then theres a bump out, then up about 15ft to the soffet, bump out around that, then finish the pipe the rest of the way up..i think this is the only way?? I would like to extend the pipe coming out of the garage about 3ft horizontally, so i have a straight shot up to the soffet, but i dont think this is possible due to the bracket and "T" having to attach to the house...any ideas?? Ive attached a picture of a house that is set up like mine, so you can kinda get the idea

opps sorry, mods can you please delete to previous posts?? Thanks.. and heres the picture...

i am thinking of pouring a concrete footing, and making a brace out of angle iron for the "t" and house bracket to be attached to...this way i can come out of my house about 2.5ft and run straight up to the soffet,..anyone ever have an installation like this before?? Anyone???

the pipe would come out almost between those lower windows..that lower ledge sticks out 13 inches, so i would have to go horozontal far enough so my t would clear past that, and then up to the soffet, where i would use 30's to go up and around it, as it sticks out 15 inches..

ive never thought about running it inside..3 bedrooms are above the garage, so that leaves me 3 closets to choose from...the hallway closet that would be best is already takin up by the hvac ductwork running from garage to attic

just some quick measurements and i can run it up between the two cars, about 2ft off the center line, and that will put me into a bedroom closet, and almost in the center of the house...this way ill only have about 3-4 ft or chimney showing extending through the roof...thanks guys!