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What an incredible concept on each of your parts. To want to create and leave a memorial a celebration of one's life as a reinvention of all the parts you loved best. William above offers great site for inspiration. my simple idea was to suggest once gutted to use shell as a community garden art piece, in his name, that could only grow better with time. Hoping you find what you need.
I just saw a post of the truck bed being used as the bed frame so you could read the truck make and see the tailgate as the foot of the bed?
make a memorial garden with lots of different plants coming out of the windows and the back filled with veggies
Use the tailgate to be the back of a bench in your yard.
Use the tail gate as a head board and the front part can be used as a flower bed, so sorry for your loss.