Collecting 1/16 scale means for me space is also an issue, recently i sold some models to free up room for more detailed once.
I like to be abel to look at my models, so i tend not to box stuff up and store them, but force my self to sell the less wanted once, some models ofcourse will never leave my shelfs again.
I try to keep up buying the RED Ertl precisions coming out, and i am still looking for some older precision altough i am getting close.
Also i buy the toy tractor times tractor every year, so far i have all of them.
And i am almost compleet with my foxfire farm collection.
I have about 10 custom 1/16 pieces in my collection, and i think that number will grow in the future, custom tractors and implements are nice to have, specialy when they are machines you worked with your self, and they are great conversation pieces.
I do have some 1/32 tractors and implements, and i am specialy proud of the tractors Peter (MPR Models) did for me, he is working on a Volvo BM for me now, and he did a Ford 6710, Case 1390 and a JD 1120 for me allready, all tractors we had or have on the farm.
Erik