|Is there a standard plate thickness?|
What is meant by 10, 6, 4?
The norm has become 10mm bottom, 6mm sides and 4 or 5mm for the cabins, but thinner plate should not be discounted. Many older hulls of 4 and 5mm, properly built and maintained are still going strong.
Beware of too large a disparity of thicknesses for successful welding, or too heavy a cabin which makes a boat top heavy. Hull strengthening is just as important. In the event consult your builder and the Code of Practice for hull construction drawn up and approved by the Canal Boatbuilders Association.
What size engine do I need?
If there are not enough skilled man-hours and quality equipment and materials allowed for in the price, then don’t expect the earth. On the other hand, some boats at the cheaper end of the market represent excellent value as far as they go. We all know that consumer items, whether they be shoes, or vegetables, or meals in restaurants, all vary in price and narrowboats are no exception.