If you are going to build a lot of rods, the solid box will be better for you.
On the other hand, if you are only going to build a few rods, the tent will suffice.
Or, if you want to go to a simple method, just stop over to an appliance shop and pick up a cardboard refrigerator box and cut it down and tape it together as necessary to form a box for you. A bit clumsy, but it will work fine for you.
Or, if you wish, you could just take a string of about 4 or 5 standard light bulb sockets with 50 watt bulbs in them and put them behind the drying rods on the bench and sufficient heat will be generated to nicely warm the rod without the need for a box.
You could just do the bulb thing and then take a thermometer and after having the bulbs on for a few hours, take representative readings of the air temperature in the area where a rod would be drying.
If the room is big and the area is large, you could just take a piece of foil sided foam board, and put a dowel in each corner to support it and support it a couple of feet over the top of the drying area and that would contain the bulk of the heat to provide a reasonably uniform drying area for your rod.
Or you could pick up a panel or two of rigid foam insulation and a roll of duct tape and use the insulation to form a 3 sided box for drying. If you wish, you could also have a front cover of foam that could be held in place with duct tape. When needing access, fold the front cover back on the top.
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Best wishes
