I think the header art is cool; just don't tile it. Align/float it right, behind the Search field (or maybe padded out from the right enough so that the search box doesn't overlap the mech and runs above the head of the microfigs).
I'd also go ahead and put a white shadow (no offset, minimal feathering, minimal number of pixels) behind the red and black text, and a black one behind the white text, so that it will stand out against nearly any background (i.e., for reuse elsewhere, even if the header art is blown away).
[These are all formatting opinions; I would make other aesthetic changes to the text, like thickening it slightly so that it could be subtly beveled, massaging the kerning for a more pleasing balance between the narrow glyphs of "MOBILE" and wider ones of "HANGAR"... stuff like that. But I'm not trying to change your groove; just make the groove work reasonably well.