I would look at other sites that sell models and get an idea of what the likely prices are for different models. Also, you might consider whether people would be more likely to buy a 'package' rather than individual items, or perhaps you could offer both. I certainly think it is worth a try, especially since the expense on your part to arrange for sales shouldn't be too much. Your items seem worthy of sale to me. I have found that most people are happy to give advice, so if you decide to start selling your items, pick someone you admire and get their advice.