any jobs are possiable but best advice is remove the lot, while its in 1 lump you can pressure clean the whole unit so when you dismantle it no crap drops into the box and also you will have a better veiw on what you propose to do especialy when matching the parts, hanging upside down your arms and legs in knotts trying to fit some thing you cant see and putting things in the wrong place, believe it, it does and will happen