yes there is plenty of clearance for the filter, the plan is slacken it from the top then unscrew and it drops out the semi circular cutout shown before in the "making" pics. Thats the theory anyway
yes it is a milwaukee impact wrench been pretty useful on the project mostly when stripping it down, if it wasnt an important bolt it was sheered off and if it was important it was wound off. its gone an insane amount of torque only bolts it struggled on were the towbar bolts but the thread protruding past the nuts had rusted so needed to be cut off. yeah i guess I'm quite lucky with the tools but before i went out and brought a landy i made sure i had most the stuff i was likely to need.
Sam