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Explanation: there is no 'l' missing, your field is not electronics, but construction. I'm not an expert in this field either and I don't know the right term, might be timbering drawing or boarding drawing
verschalen=to board, to timber, to batten
according to Langenscheidts Fachwörterbuch Technik
Explanation: 'Schalung' is the material used to hold concrete in place while it is soft (usually timber). For complex structures or where it is intended to leave the concrete exposed 'Schalpläne' (without the 't') are drawn up so that the pattern made by the shuttering looks satisfactory.
Ref: I was an architect and builder for about 20 years