NOT ENOUGH HEAT - HEEELLLLLPPP!

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Extend the chimney down to the cooking grate with a split juice can or a piece of aluminum flashing formed into a roll.

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^^Best piece of advice

Also use a disposable aluminum pan under your fire grate with the one end folded down for air flow. When it fills with ash pull it out and dump. Unless you don't have a side door on your firebox

Just looked at the model. It probably has a small baffle on the side of the firebox. Get yourself a piece of steel that can reach in that hole and drag out the ash. I used a bent spatula.

 

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I have a snp also, found mods on yahoo,( tuning plates, baffel, fire brick in cooking chamber,extending the outlet tube to grate level...) i found some charcoal burns better than others. a cheap tuning plate is to hang the cooking chamber charcoal grate upside down this will help even out heat from end to end.

I'm in the prosses of building a couple of uds's now, so the snp will probably be not get much use.