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You say it'll be a special one off fork however really it is something that I can get make from any frame builder for much less without the pantographs.
For me, being able to get a proper Columbus air fork is more special as I know that not anyone can just knock one out. And I also know that the frame was originally intended to be used with an air fork
haveo-
I see your point if another fork is much cheaper but the one you mentioned seemed quite costly. Even with an Air fork you will not have a Tommasini frameset only a Tommasini frame with another fork. You could get a Ford Mondeo engine to fit into your E-type lightweight but it will not be a classed as a real Jaguar.
The fork is a large part of the frame. And those Air ones don't even look right.
You are more than welcome to some pics and measurements from mine if it helps.
Si
Si46
Send them a couple pics of the project and I think you will find they are very helpful and not avaricious .
Any extra cost will be well invested as the fork will be a 'Special One-Off' by the original maker.