Especially if there are curved frames being made specifically to take the curved glass, you need to ensure that both match correctly.
Usually when using Aluminium or PVC windows, the main concern is that the finished radius is correct and that the frame is not warped. When timber frames are being used, apart from the radius being correct, you need to specify that the rebate should be 20mm wide and deep enough to take the specified glass thickness.
e.g. – you need a 50mm deep rebate to take a 28mm thick d.g unit, the remaining space being taken up by the retaining bead. Also make sure that the retaining beads on any curved framework are on the outside and not on the inside.
An important part of design involves giving consideration to practical elements. For example, if you are building a concrete stairs, or if you are talking about large sized panels or even if you need to consider a shape which is not a true curve, we would encourage you to let us know your ideas first before committing to them. Irregular shapes for example are usually more expensive and a little thought can often bring about economical solutions.