Coljack - if you'd bother to check the location - you'd have noticed that we are 120 miles south of the enquiry !!! Why would we bother !!! Just trying to help somebody out. Is that not what this website is supposed to do !!!
David - if you'd like to contact me I'd be delighted to discuss something very similar to your drawings. We have as a concrete precaster something very similar that we designed and produced for another DIY enthusiast. 01661 833923. Telephone