I've had a "traditional" built up wood flight box but I gave it up. There didn't seem to ever be enough room in it. Plus, having had back surgery it was getting hard for me to carry a flight box to the flight line that was getting heavier every weekend. So here's what I did. I too bought one of those oversize tool boxes available at Lowe's type stores. I also purchased smaller tool box that had several smaller parts boxes. The large box had to have several features, it had to have wheels on it so I could pull it, it had to have enough room in the bottom for a 12 lawn and garden tractor battery, and it had to have room for 2 1-gallon fuel cans. In this box I put only what I need on the flight line, battery, fuel, starter, fuel pump, volt meter, tachometer, small hammer and rope to hold back planes, and quick charger. This is what I take out to the flight line with me. It contains only what I need to get my planes flying. In the other tool box I put in all the other tools I found I need at the field, plus small parts, props, epoxy, and CA glue. This box stays in my truck. If I need to do a field repair I take it back to my truck and use the smaller tool box.

I've found that this setup has worked great. The box I take out to the flight line doesn't throw my back out every time I lift it, and I still have my tools with me to do repairs.

That's my 02¢ worth.