dang, your in for some boring ass polishing. Let me explain it to you in detail from start to finish with all the equipment and materials you will need but i promise if your not patient enough then dont start because you will abandon this project.
You need 400, 800, and 100 grit water sandpaper. You got the aircraft paint remover already so your good there. At least a 6" bench grinder . You need the black and green polishing compound . and atleast 2 polishing wheels , one hard for the black compound and one soft for the green compound.
Remove the paint well. water sand with 400 sandpaper to first till its all smooth and even. Hit it with the 800 next , this will beging to somewhat polish it , The 800 step is very important as all the imperfections you failed to remove and failed to polish will show up in the next step.
After you hit it real good with 800 go to town on the bench polisher about a 4" radius at a time with the black compound and hard wheel first. You want to keep enough compound so that it will cut into the metal but too much will burn and melt it and it will loose its metal cutting properties . Use easy to medium pressure you can hear the motor stressing if you go too hard.
Once you feel you have enough shine then hit it with the green compound and soft wheel.This is the final step and it will clean up the aluminum dramatically and give you the best shine you will be able to achieve . You can keep alternating between hard wheel and soft wheel if you feel you missed something . Also , you want to keep the wheels clean by using a rag of something with teeth to remove the old compound . This is aluminum so it doesnt rust , it will haze up with dirt if not polished correctly though
To do a good job with a 6" bench grinder it will take about 8-12 hours . Let me know if you have question , Im alway polishing stuff