Acousta 116 plans

The Acousta 116 plan is a commercial product, as stated on their website (relevant section quoted below), so you should be able to buy a complete set easily enough:

Full sets of plans are available from Lowther Loudspeaker Systems Ltd. There is a charge for plans, but they are free of charge if requested when drive units are ordered. Otherwise they are chargeable in accordance with the price list. Plans are available separately on paper, or the complete set of Lowther plans are available on C.D. See Price List for details.

For your convenience, refering to the Lowther price list, the price for a set of Acousta 116 plans (hard copy) is £25.00 + VAT if applicable. Or you can purchase a CD with all of their cabinet plans contained for £35.00 + VAT if applicable.
 
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