--It seems like I do one of these every 5 or 6 months, but there *is* a new-ish edition out so...--
  So I've recently cataloged my space marine collection, and was wondering if you more seasoned/in-the-loop players thought I could cobble together a list that's at least semi-competitive, something I might lose with but that would give me a fighting chance at a random gamestore battle (unlikely to have time for a tournament).  I've got codex space marines and codex dark angels, I'd prefer to stay away from data whatevers or allies outside of those books for monetary reasons 

 It doesn't need to be a specific list all pointed-out, just a general type of list, specific chapter tactics and unit choices, stuff like that would be close enough.  
Space marine Pile O' Doom: Now with blurry photo!  
  Infantry/bikes:
 40  tactical marines
 20 more marines, suitable for veterans or sternguard due to robes
 10 scouts (15 if I convert the 
LSS crew to have bases)
 25 terminators, DVx3, 
Aobr, 5 custom that may not do outside of 
DA 14 total bikes
 4 jump packs army wide =/
 3 
DV librarians, lots of exta bits to asemble most any captain/chaplain/chaptermaster/
motf/etc
 1 kitbashed 
MotF/Techmarine 
 There are enough guns that I could probably manage 1-2 devastator squads.  I have a stupid amount of missiles and a bunch of heavy bolters (yawn to both still right?) but maybe enough lascannons and plasma (especially if taking a 10 strong squad and splitting it is viable).  I have lots of lascannons that could be converted to fit marines, and the same goes with most other guns, to an extent. 
 Vehicles:
 up to 8 rhinos/variants, 2 predators with sponsons, would have to buy/convert any demolisher/
ww/new 
AA tanks/etc parts.  Parts to make several of them razorbacks.
 3 drop pods
 4 dreadnoughts, can field them however, would have to convert riflemen or ironclads but am fairly confident of doing so.
 Land raider (standard 
LC pattern)
 Land speeder storm
 3x land speeders (parts to make 2 legitimate typhoons, enough missile pods to possibly cover a third)
 Stormtalon 
 Potential 
IG/
AM allies:
 I don't have theh 
AM codex, but if it were absolutely necessary to use guard allies to make what I have work then I've got a bunch of Mantic corporation marines that could fill in for guardsmen, or with maybe one box of cadians I could scrape troops+
HQ to also field: 
 Leman russ with no sponsons.
 Chimera
 Valkyrie (probably enough lascannons to do a vendetta). 
 I've don't have any of the fortifications, would prefer to use a list without them but I guess buying the defenseline wouldn't kill me either.  
 Soooo...  What could one cobble together out of that pile of goodies that could actually hold it's own?   
 Am  I just up poop creek without a paddle if I don't have a fancy new Knight or some other formation like 3 stormravens or whatever it is they do now?  I'm not particularly worried about winning a tournament but I'd like to put up a good show against some random gamestore opponent if I get the chance to play sometime. 
 Thanks for looking!