Hi David,
I'm still fairly new at this so I assume others can give you more knowledgable advice, but I believe it would be entirely possible to maintain or gain weight on the McDougall plan. You're just one of the "lucky ones" who can add nuts, seeds,and higher-fat calorie-dense foods more often. Fruit juice is another great way to accumulate "healthy calories".
This plan seems to accommodate for people of all types, and with very good outcomes (healthy blood pressure, cholesterol, etc.).
In my own experiences of just about 7 weeks, I've lost 13 lbs (a very healthy ratio of weight loss) however, I could easily have gained had I not carefully watched my intake of nuts and tofu, and had I used more tahini in my hummus
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Also, my blood pressure had risen over the past six months but is now back to my healthy norm (I think it was 117/71 last I checked).
In any case, give it a shot! Just make sure you're eating enough grains and legumes with all those fruits and veggies
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If you want to gain a little weight, an extra serving of beans and brown rice would help!
See you around the boards!
Alyssa