where is the best place to get instant feedback?

@Bunny83, if you are online, (or anyone really) what would be the best way to set up slots in a panel to only take in certain game objects -> set by an EditorWindow. I want to have a ship parts panel, with 7 slots. each slot is for a different type of blueprint. these blueprints are created in an editor from Items and other ingredient. I want each slot to have a list of objects it can take in But they are of same type by a set enum? not sure that's best or would a readonly string be better. also depending on what level the player is, then only up to that tier is aloud on that slot. aka "if (plevel == 45) then tier 1-4 times are aloud and 5-7 are not." Link to my code so far (on Gist.Github)