Hard luggage Rack building on a budget

[goodwoodweirdo]

Yamaha Ténéré 89.

Hi folks,

I'm planning on building my own hard luggage rack. I have a second hand rack from a Super Ténéré for the loops and fancy using second hand Army Ammo box's. I don't want to go over the top but the system needs to survive a drop.

My questions are:

Positioning; should the tops of the boxes be inline with the top of the seat ? or lower how far back should they be ? or say inline with the passage foot pegs ?

The rack will be fitted mid chassis and with a cross brace, is 2 fittings to the upper chassis suffice? not to the seat fixing but the standard Ténéré rear rack fixings.

Lastly the Ammo box's are cheap and strong ! but I've been told they weigh in at 10 kgs each ...... I plan on then filling them with spares and camping gear - what's a reasonable "max" weight I should work too.

I've decided on metal over material for security reasons, for now the trips will be mainly Europe / Turkey / Egypt so no RTW just yet .....

I'm already using a (medical) military box as a top box, 100 % waterproof and almost indestructible. A little heavy but hey who else has a decompression switch on there top box ;-)
Your comments welcome..

Many thanks Matt