<p>Thanks Jim. Making boxes for single models is ok, but doing them for larger sets always gives me trouble. When I first did the box for this COOP set, I found the upper and lower box material was too thin. Also, it is more difficult to do a good lift off lid box than a flip open one.</p>
<p>So, this time I did the lid first, and made it stronger with thick carton on the inside.</p>
<p>The lower part is seldom a good fit to the upper part. Either too loose, so it opens by just lifting the lid. Or it is too tight, and it does not open.......</p>
<p>The correct way is to use a slight upward force when lifting the lid, and the air comes in. When placing the lid on the lower part the air should press out.</p>
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