Audi 100 C4 to A6 conversion in progress

My friend&1991 Audi 100 2.3 quattro is almost finished. He wants to &to A6. Interior need a bit more work than he thought first time. Some other friends also were there to visit me so we had all the 5 cylinder quattro C4 chassies what ever made; 100 2.3 quattro AAR A6 Avant TDI quattro AEL S6 Avant quattro AAN And last but nut least my 200 10VT quattro as well :)