hey guys i am building my first rack and my collection isnt huge right now but it will be ina few seasons once i pair all my snakes up. so heres the deal. i want somthing basic and cheep. i dont use flexiwatt heat tape and have literly 42 heat pads of all sizes(too much moneny and didnt know what to do with it all) so i will be cuting holes in the back for wires. no heres my question. i am going to be making three racks one 91 quart rack containg 9 bins threee per shelf for my kings milks and corns, a 41 quart rack for futurer ball paython plans. and a 11 gall rack for babies in the futuar. all three racks will contain 3 bins per shelf and 9 bins all together so 3 shelfs per rack. i hope this makes sence. if anyone has any better ideas that will still be cheep let me know plese. also we have everything figured out. my dad thinks plywood will be ok since the snakes arnt living in the shelvs them selvs they are living in the tubs. i didnt think plywood would be best because its not sturdy. what wood is best ive herd melemin is but isnt it expincive? i am on a budget any help would be great