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