Thanks to all so far, esp. Jimmy, for helpful feedback. I did make many of the textures smaller (esp the 'blurry' ones; 128x128, wtf!) to keep download filesize down, but will increase in later releases. I'm not really a texturer as such so if anyone wants to improve them, please feel free.
EDIT:
Checklist of things to do then:
New loading screen (done)
Flatter viewscreen (done)
Red alert status
'Darken bridge' status
(Can't fix at present. This is a generic prob with modding existing bridges as those original light changes hardwired to nifs. When nif is modded, unless original lightmapping/texture names retained - which is unlikely - light/alert changes are lost. Sorry
. Until can get advice how to create same in all modded bridges, no map/light changes attainable).
Bump up texture resolutions (done - ones Jimmy mentioned were very low!, lol)
Fix F1/F2 - Confused about this. On my wb bridge, F1 goes to helm, F2 to tac as on other bridges, not ceiling. So can't see prob tiqhud mentioned.