It's the last sentence of your first paragraph and your second paragraph that worries me.

You should read the wiki article on Magnesium, and then consider if you want everyone around you to bear the risks you are proposing. I can see several vectors to accident and injury of yourself (which doesn't really bother me, so long as you are witting - and you seem to be) or to others (which does - I might be one of them).

For the benefit of others:

Wiki: http://en.wikipedia.org/wiki/Magnesium

Peridodic table: http://www.google.com/imgres?imgurl=http://www.ptable.com/Images/periodic%2520table.png&imgrefurl=http://www.ptable.com/&h=1080&w=1440&sz=79&tbnid=JsfFP8TdgDCmFM:&tbnh=113&tbnw=150&prev=/search%3Fq%3Dperiodic%2Btable%26tbm%3Disch%26tbo%3Du&zoom=1&q=periodic+table&hl=en&usg=__pdvx4qjuqvGYY2L3XB-PcXpw2lo=&sa=X&ei=qpOaT6rjEYiN6QHPxfCSDw&ved=0CCkQ9QEwAg


To clarify my concern, I have historically used tent stakes in applications involving fire (lifting a dutch oven lid, poking logs, manipulating pots, etc...) when I'm improvising; I can forsee a tragic accident if you built your stakes and they were used by an unwitting or unknowing person for an application other than what you intend (as just a tent stake).

Alternatively, is there a magnesium/aluminum alloy that might achieve the weight savings you are looking for and that is lighter/cheaper than titanium? That MIGHT reduce your fire risk and achieve what you are looking for.

Steadman