l would like to build a dwarf wall for a conservatory.The only problem is that l have a manhole about 6 foot from the external wall and slightly in from where the wall would go.How can l get around this without causing alot of work and money. l was thinking of building the wall to go up to the manhole then going inwards then in a straight line again, but working around it like that would cause problems when ordering for a conservatory would'nt it. Help please l'm struggling on this one.