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Ian, first of all welcome to the forum. You may want to add a bit more detail as to your modeling experiences and/or your shop in the introduce yourself section, where more may see it and add their welcomes also.
Please understand that this is not a "commercial" forum however, and although plans are offered at times, it is generally of completed, and tried and proven designs and is not the main focus of those members contributions to the forum.
1. How much is it going to cost? - Price will effect how many people will be interested & remember many who wanted one have already brought the original casting set (complete with its features)
2, Where are you going to get it cast? The prices UK foundry's charge have more than doubled in the last two years due to new health and safety requirements.
3, Have you made any model IC engines before?