i see great interest here!
little rethought:
range the V2 will have bigger range than V1, eg.
v1 : 9 tiles,
v2: 14 tiles.
it will be tartgeted as normal attacking abilities and ONLY buildings will get targeted, after launching the launch site vanishes.
damage will be almost the same eg. 30 on target tile, 10 on second tile (in reality the warhead almost same v1 850kg, V2 slightly bigger 950kg)
the real money cost was
V1: 5000 RM
V2: 50 000 RM
for comparison a Tiger I was 250 000 RM
building time will be about
V1: 4 engineers of build action.
V2: 10 engineers of build action.