Fairing should be fibreglass and will repair easily with fibreglass matting and a decent filler such as Isopon.
Find the end of a split and drill a small 3 or 4 millimetre hole at that point before filling, it will stop the crack opening up further by releasing the stress at that point.
Lugs can be made from small bore steel (stainless if you can find any) tube and matted onto the original panel.
These fairings are superb to work with and given patience you will achieve a good finish.Rub down and build up with a good filling primer making sure you have no tiny air bubble pin holes in the surface prior to painting.
Good luck, harder you work luckier you get!