DIY:
(wooden yard stick / 2 X" lengths) + sticky Velcro > V3 = stilts
The end panels of the v3 are also the heatsinks for the voltage regulators. That makes them the hottest part of the preamp, especially when running at higher voltages. As a result, some tape adhesives would melt. The v3 can get very warm.
A couple of industrial zip ties (possibly doubled up for additional length) should be able to hold stilts in place so long as the stilts have some padding to generate friction against the case.
For a long while I ran my v3+battery, and 722, within a "target" dish rack cage. This protected both units in the bag, and allowed access and strain relief for cabling. The 722 hung by the face plate handles, with velcro or zip ties. That allowed me to remove it for gigs where I needed it to be out of the rack. At some gigs I would strap that little rack under a shelf or rail, when a bag wouldn't work. It's a really slick setup and cost less than $10 to make.
I'd actually prefer a rack like that to stilts, because the v3 can be made to come in and out easily, and it is very well protected. You lace zip ties through the rack grid to support the v3 across the bottom.
Here is that rack in action, on an evening where I am running the v3, aerco, 722, and microtrack.
http://taperssection.com/index.php?topic=92547.msg1260989#msg1260989