Tony
Interesting use of gas strut on the boot: like it and may well do it myself.
But is one 100nm strut enough to actually lift the lid, as opposed to holding it fully open?
If so I may well use two 50nm struts: readily available from both
ebay and Amazon (

)
According to the ebay seller the following table shows relevant weights/forces, but this will also depend on the distance from the pivot (laws of physics on leverage etc etc)
Recommended door weight / NM force.
•50Nm = 0.9 - 1.5kg door
•80Nm = 1.5 - 1.9kg door
•100Nm = 1.9 - 3kg door
•120Nm = 2 - 4.1kg door
•150Nm = 4.1- 6.2kg door
As the boot lid weighs 1.54kg at the catch (not the full weight, just the supported weight at that point), 2 x 50nm should be enough.
Look forward to your comments, and others (provided we don't get a thesis on the laws of physics!

John
La vie passe vite: vivez la avec elan(s).
Elan S4 DHC 1969
Elan SE turbo 1992
MB CLK 320CDi 2007
Boardman Elite SLR Endurance 9.8 carbon road bike
Evora 2010
VW T4 Campervan