Need Any Welding advice?

No pro welder, have a little experience /self taught tho. Do have a 175 mig, and a stick welder.
Haven`t used the stick welder but once since I got the mig., ' ON A TRAILER" . I have totally redone my 68 barracuda w/ the mig as needed , but haven`t done any heavy "thick material" welding w/ it...
I am now trying to build an alum. air pan to seal my 6 pack scoop to the throttle body, which is up in the scoop. The front of the throttle body is about 2/3 up in the scoop, and the rear is barely below the hood line , will be a menagerie of diff. pieces and angles , due to installing a victor intake on my 440/505 in the 68 fastback.
It will be .075 to .090 alum. sheet . I might have to tack it up and take it to a pro welder w/ a tig welder , depends on weather I can get it to work decently here or not , Thats the reason I asked the question to start with------so far my spool gun welding ain`t too hot !!
I`m wondering if a person can stitch weld the alum sheet successfully .

No bad mouthing here to the Tulsa welding school graduate, and I`m sure he knows more than I do , but professional welders I have worked with over the yrs. have all told me the graduates needed to learn welding , out on the job after graduating !!