WARDY, i'm doing the same coil over conversion at the moment.

I just picked up a set of VW Golf Mk1 front inserts from Pedders, they fit in the standard struts perfect so no honing out the strut at all.

The Golf inserts are 100mm shorter than stock, so i'll be cutting 100mm out of my strut tube (or I might decide to cut 75mm out and run a 25mm spacer inside the strut) when I do the coil over conversion.

What i'll be doing is cutting the top of the strut off 50mm down, then cutting 100mm or 75mm out, then re welding the 50mm top section back on. This is good for two reasons, it will retain the threaded section for the cap to screw the insert down with and you'll see this top section of the strut is from the factory honed out about 30mm down which you'll need for the insert to fit as the Golf inserts taper at the top slightly bigger in diameter (actually the stock ones do too)