Funny, I've never had a problem assembling the old metal Wraithlord (there was no 3rd ed wraithlord. It was released in RT as the Eldar Dreadnought, then slightly re-designed for 2nd (newer banner pole with weapon mount, and redesigned hands/arms) or even the metal Warwalker. I just took my time assembling them piece by piece. 5 minute epoxy works better than superglue for these, btw. Of course, back then, we had instructions for putting them together.
Same with the Crusader. I found the secret to gluing the metal bits was to dry fit them first, see what needed fixing (filing/etc), then (with a good glue, not that crap that GW labels 'glue'. A good, industrial cyano-acrylate adhesive like Loc-tite) glue the bits together, using the bare minimum to get the job done (too much superglue doesn't help, as it doesn't stick to itself too well.).
The landspeeder is, however, both badly designed AND moulded. Anything that requires torquing of the kit across two axes is not well-designed. Funnily enough, to assemble the three that I have, I ended up cutting the pieces so that they looked more like the leaked pics of the new re-cut speeder sprues.
Hey! Where'd ... Everybody ... go?