This diagram outlines the major parts of the assembly.

Having opened up the Vesta camera (carefully !) and extracted the boards, the steps in construction are:

•  Carefully pull off the signal cable off the rear and separate the CCD board from the main board - they plug together.
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• Remove the metal lens housing from the CCD board by undoing the two tiny screws.
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•  Unsolder the microphone and green LED - they'll get in the way.
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•  Cut a piece of thin plastic board (I used blank printed circuit board, copper face away from the CCD board) to the size of the flat area inside the back of the SLR camera. The thickness of this board is critical - it must space the front face of the CCD to a position just in front of the focal plane of the camera i.e. the film rails. If the CCD is too far forward, the shutter blind will catch it, but focus will nevertheless be possible by screwing the lens out, and (b) if  it is further back, behind the focal plane it will be impossible to focus the completed camera on infinity because the lens can't be screwed in 'beyond infinity'. Note, the more accurately this is achieved, the better will be focusing using the pentaprism. - but no-way must it be behind. Note - all this is only important if the camera is to be used with conventional 35mm camera lenses, when used for prime focus photography on a telescope, the focusser there will accomodate any errors.
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•  Having fixed the plastic board temporarily in the camera, the shutter is locked open and the outline of the film aperture scribed onto the plastic from the front of the camera. This will then allow you to locate the exact centre of the image area on the plastic. A rectangle slightly over the size of the CCD is then marked around this point and cut out.
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• The CCD board can now be placed in position and marks made through the two small holes  on either side of the CCD onto the plastic board. Having drilled them out, two small bolts can be fitted through and fixed to the front surface. I soldered them in place, epoxy adhesive could be used. The CCD board can now be fixed carefully to the board by means of these bolts.
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•  Having plugged the main board back onto the CCD board, its now possible to measure just how much of the camera back will need to be cut away to allow a comfortable clearance around the Vesta boards. Having done this, the next task is to remove the spring loaded film plate and associated bits from the camera back. The aperture must now be marked out and cut out - in my case by laboriously drilling and filing. I was lucky, I had already removed the camera back from the main body, so could work on it with ease. When the cutting was complete, I found to my delight that the back would still fit into its original position, would hold and lock shut, and, with a small amount of packing, hold the Vesta assembly secure by gripping the plastic board.
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• All that remains is to fashion a small metal cover (thin aluminium) to protect the circuit boards . I fitted a small 40mm square CPU fan in the base of my cover to provide cooling.

    Note that apart from removing the redundant LED and microphone, no modifications have been made to the Vesta - it can be reunited with its original case if needed, although the camera has been severely trashed !.