Using an offcut from the roof covering fabric I found that I could wedge it between the binnacle/dash/fascia panels all around the binnacle.
To work out the shape I needed I put masking tape all around the binnacle, just above the stitching line. I used this as a datum to measure how much covering was needed at points around the binnacle. Starting from the point that was where the top of the binnacle was widest I marked increments at 4" (100mm for the younger folk reading this) as well as key points (eg corners, major changes in direction etc), and then using a sewing tape measure (so I could wrap it around curves) measure the distance 'above and below' the line of visible binnacle. I then added half an inch to each measurement for fabric to be tucked in. I decided the best place to start and finish the template was in the centre of the steering column.
Using these measurements I created a template of lining paper of the required shape - which was 2m in length and up to 450mm wide but was very irregular in shape. To test this worked I bought some cheap lining fabric (cost £2) which was quite silky, cut out the pattern based on the template and offered it up in the car (having removed the two fascia panels and the switch trim panel). It seemed to work so decided to do it for real with the actual fabric.
At this point I had a bit of a brain fart and thought that the switch trim panel would also look good in the alcantara and decided to cover that too. So I glued the fabric to it, dressed it to all the apertures and then offered it up and the finished effect was basically crap - so I then spent two hours peeling off the fabric and rubbing off the adhesive to return it to its original state.
The alcantara was then fitted and ultimately fitted really well. The fascia panel bits were easy as they held the fabric in place, for other points (binnacle/dash, binnacle/console) I used a plastic scraper or metal ruler to push the fabric into the joint. It took a couple of hours to fit but the cracks are covered, the hump is disguised and the whole binnacle looks better than even I thought it would (with the added benefit that I can remove it at any time to return it to original to re-cover the binnacle properly whenever I want to). Total cost of the job was £30 for fabric.
The only niggles with the end result are a couple of fabric creases at the bottom left corner but these are minimal and being a black fabric are not very obvious - to others lol. Anyway, photos below.
Apologies the finished photo isn't better but it does give the general impression.
By the way, does anyone know it Esprit seats fit in an Excel (width/subframe compatability)?