I agree alloy is lighter than steel, but alloy needs to be thicker than steel also to give it more support, thus thicker alloy, thiner steel, same weight. ( some times )
As for light guards, theres some cheap and simple ones out there then theres some very expensive ones, from my own personnel view, 95% of Defender owners would have a heart attack at paying over $300AU for a pair, high end Defender parts is a very niche market.
I recently received a pair of Kahn Defender Light Guard, around $430 with shipping, nice outer box, nice packaging, but I was some what disappointed with the guards, yes the mesh is mine spec, and the welds 100%, but $200 would have been too much to pay. We could reproduce like for like in the shop for $120.00
Instead we just made a simple version, thats going to RRP for $120.00.
Paying top $ is fine but its got to give you that special feeling, or you feel like you have wasted money.
On a side note I do like the wing Indicator guards
Heres ours, the black will be paired Silver behind the logo to make it stand out more.
Still great to see other people coming up with new ideas.