Until a grenade comes along!
Haha. True enough. Some of my hands did got blow up with an "unexpected" enemy RPG. I do wish this mod will have some extremely strong shield so the "true" Testudo will shine once again. lol.
As a fan of Spartan: Total Warrior, I see blowing up testudo formations as an art form. Even if they're my own.
I don't believe this is possible as XCOM does not model ballistics, it just fakes it fairly convincingly for 1994. No matter how strong a shield is, it's only an armor value for the unit holding it. Everyone in the AoE has to take the damage roll using their own armor values, and if the blast is close enough it goes against "under" armor automatically. Testudo only works against non-AoE projectiles.