Fast progress! Coming on great ÂÂ

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I do have some constructive criticisms / suggestions for improvements / obsessive requests for detail however:
Is it possible to get small hemispherical (or cylindrical - but hemispherical fulfil the same purpose and I suspect might be easier to cast) indentations on the side and front of the barrels of the heavy bolters, the fronts of the barrels of the lascannons and also on the the top of the four exhausts? Even if these are tiny and not very deep they should be noticeable and be the sort of detail that will show up nicely when a black wash goes over the metal colour on there. If you do these you could also do some very tiny hemispherical indentations around the sides of the exhausts and also do the ridge with the squared bits on the top properly too. Personally I suggest taking a leaf out of E&C's book and model it as much detail and resolution as possible - if it prints and come out fantastic (and judging by the printed Malcador's detail it may very well), if not no real loss apart from a little extra time spent. ÂÂ
Your rivets look muchly over-sized! Please could you not have them smaller and subtler? The ones E&C did for his Malcador had a radius of just 0.2mm diameter and they did print - see
here. You can get away with out of scale massive rivets on Guard tanks, but for higher-tech Marines ones it just looks wrong. Frankly I'd rather have no rivets if it came to it than over-sized ones.
The bit above the heavy bolters, like a column or support it hangs down from is
way to wide - it should be only be like 25% as wide as that! The wider bit above that looks too deep too, nowhere near as bad as the column, but it looks like it do with loosing half or nearly half of it's depth.
Could you make the ammo-feed look better? It should be a belt-fed chain of ammo, but at the moment looks a big detail-less circular hopper. Simple way would be to have the middle indented a little (even if it can only be a tiny bit in - it will still be there and able to be neatly blacked out in painting). A better, but little more time consuming, way could be to model a connected chain of rectangles or something like that (even if they need to be connected by an indented middle for moulding). ÂÂ
The spikes currently aren't doing it for me, would ones more like the ones on the W40k model not work at all?
I like sound of option 1 a lot, but can't really advise about feasibility.
It's a fantastic model already

Well done ÂÂ

 I just see room for making it even more special and higher quality for everyone's benefit

(hope you're happy to have feedback rather than resenting it)