Hmm.. you could also try getting the G-Maxx extension for the chassis and see if the lipoly packs can be strapped in. If I was you, I'd raise the upper chassis servo plate with washers so that I could fit the lipoly packs in.

I can't say that they still are, but the pack I got back in February was welded.

I got mine later, i don't know.. something you could ask Austin, Ryan, he sure can tell you..