Since its pretty early here, Im gonna give it to you in synopsis form. You seem enthused about this guy, and this is a good thing. I would try and save it from further decomposition, just like the archaeologists do when a mummy's tomb is first opened up. Carefully remove all the junk and debris piled on top being as gentle as you can, and clear a pathway for it to the door. It looks like the wheels settled into the dirt so I would try and removed some of the mud. The wood parts are probably gonners, but the stuff is there for identification nevertheless.
If ts free, theres little to lose. If you get totally overwhelmed or discouraged, sell it or part it out. Looking at it as it sits, Id go for $500, yet the top bows alone are worth that in parts. Its evident that someone needed parts a long time ago judging from the timer roller condition, with mice inside the water jackets and no oil filler plug, they will have 50 generations of offspring living in the oil pan.
Drag it outside but pull it by the frame and NOT the front axle. Dont be surprised if the wheels disintegrate in the process. Get it to the nearest coin op car wash and rinse it down free of as much dirt as possible. After its dry, get a gallon or two of PB Blaster and some spray bottles, and spend the next week SATURATING the entire car over and over, every nook and cranny, seiously, just as though it soaked in a swimming pool with the stuff!
I would do that part parked on top of a blue tarp to save the driveway, garage floor, flowers and grass, and your old ladies temper LOL...Wear the cruddiest clothes you own, and NOW start to assess the project. It has barely maintained the "rusty and full of patina" barn find status, and depending on you, can be brought back "as is" which is cool, or do a total full blown restoration. The latter will need an open check book, lotsa love and dedication, and even more, education, if youve never worked on a T before.
As Jack mentioned earlier, SCRUTINIZE the barn for extra parts, including that farm trailer frame, carbs and coils in the rafters, and even that old black powder double barrel 12 gage behind a beam.
Now you see, some of us would be enthused about a find like this and some would get discouraged and call the junk man. DO NOT DO THE LATTER! Even if it is too far gone to restore, theres a ton of parts that guys can benefit from. Keep the faith and good luck. Keep the pics coming too! Pics are a good thing... ws