first off: good that you´re still alive after that car wreck

(and good that your friends recovered your 40k stuff).
that origami rex (neat thingy - have you ever considered cardboard tanks? you seem to be one of the persons who has enough experience with folding paper to do it) could be used as a dreadnought if you don´t want to mess around with custom rules (i always want to write custom rules for things, but wind up in too much confusion on the way. so i have no other idea right now... sry).
get better soon
