Yes! I'm fully in favour of the idea.
Not that I think WH40K is a particularly good game universe. It's rather lukewarm in fact. (Original Rogue Trader, what 40K is based on is better.)
However, I approve of anything which rips off Games Workshop. They've been re-releasing the same old crap for almost twenty years now, Each time with more unworkable, more frustrating rules. Talisman, Warhammer, 40K, Blood Bowl... all got worse each time they were dumbed down and re-released.
If you like something that GW have done, take it and use it - hell, we've all paid for it already. Its the role-playing game business. You're meant to experiment, adapt, and share ideas and games with friends. At least, that was the theme back in the good old days before GW got too greedy, and started charging Ł7 for two 25mm figures.
Why bother modelling ships in Mechanisto - simply photograph any painted ones you have (preferably with a digital camera, since 36 shots of each are required), and generate the appropriate spin resources. Illuminate the models with a table lamp, and use a blue filter.
I'd do it for ya... but I think GW ships look like shiite, so I never bought any.