Ian -
Let me repeat that older TMs had wood framing in the shells, and later switched to aluminum. I don't know (and I'm not sure anyone does) when the switchover occurred, but we have had indications on this board that the switch happened in different years on different models. Since B&D have aluminum in their 2720, you might very well find it in the 2720SL you are looking at (the presence or absence of a slideout would not change the shell construction). As they have said, the easiest way to tell is to pull out some screws in the lower edge of the shell. Look at the screws, and see if there are wood crumbs in the threads. Get a flashlight and peer up into the holes - you should be able to see either wood or aluminum where the threads would bite in.
By the way, there is nothing wrong with wood as long as it is solid. So don't be discouraged by the answers above - just be willing to check it out.
Bill
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