I prefer to play doth DE and Eldar rules and mix both armies in my lists, but mu Eldar always look like Dark Kin. So I converted a coven moster as a Wraithknight and so on.
And now I need Warp Spiders. Original models seem to be bulky and not proportional (like most os Eldar infantry models), so I think the best way to represent transdimensional nature of this unit is to take Mandrakes.
But I don't know, how other player will accept this, maybe there will be difficulties to enter the tournaments with some WYSIWYG requrements.
Will it be enought just to equip them with guns like Shredder, or do I need to use more bits?
What are your ideas, maybe you have seen/made similar conversions?