Ok, maybe I’m missing something obvious here…
I start with this…
Then this…
I want to be able to fill in both gaps without this…
Or this…
Is this possible? am I just being stupid?
Thanks for taking the time to look 
If I’m seeing those shots correctly, you can’t do this.
Visualize the block as consisting of 8 corners, like smaller sub-blocks. Each time you hit it with a precise chisel you remove one corner. So when you have the crossbar formation, you have two touching corners of the block remaining, or one edge.
So, you can only remove one or the other, not the bit in between them. In your last pic it looks like you have two opposite corners from the original block. This does result in a visual gap, but it’s still two corners of the block remaining.
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Thanks for chiming in mate! That’s a real pity, I was hoping I was just missing something obvious! 
If this worked it would make some of my builds look more “complete”! If you know what i mean? 
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I’m with you SilverSunn (hopefully after the harmonising power pop band?) it really does feel like it should do that.
Silversun Pickups
cant see very well what’s happening in the picture with the full block, but to chisel down to fill a chip like you have there, you shouldn’t go for the diagonal shape (which is flatten block with precise chisel removing diagonal corners),
if you are trying to fill two corner gaps like that with one block, you won’t be able too, because (as @Nightstar explained) you cannot remove the middle of the diagonal shape to leave opposite corners floating
chiseling one block can only fill one corner chip (gap) like that and to do that you follow these steps (you probably know that):
here are two chips like yours to be filled
go for slab first (half thickness, either bevel or square chisel hitting twice):
then chisel off half of it (either horizontally or vertically):
then precise chisel half of remaining shape (either a top or a side depending on whether you went for horizontal or vertical shape earlier):
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Except I was hoping to fill in both sides, using the one block, which isn’t possible. 
Anyway, I made this…
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I wonder how that would look with some liquid in the chiselled blocks and glass panes in front.
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in that case you would have to go for double the size so you need 2 blocks to span the arms of the pattern - that way you will have chips filled in both arms
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oh wow, I didn’t think of that, thnx man.
Also @boundmore, I meant to fill in both sides, like this…
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Yeah, double the size could work, but it wouldn’t fit my build then! 
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double-size the build!! 
watch super size me - the film - to look for instructions 
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The shape (block) you want …
… is one of many shapes we are missing,
and we all 
waiting for at the moment.
Who knows, maybe we get some of them next year 
also, see this topic below
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You may be able to get what you want if you make that same shape with precise bevel chiseling… it’s basically a half block offset of the bevel chisel. May still not work but it’s a thought.
Oh wait I may be thinking precise slope chiseling, I’m a little rusty. There is an option where you precise bevel chisel all but opposite diagonal corners to get one block split in two but it doesn’t work here.
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it is slope - you get kind of horns; still, they are connected and don’t split into 2 separate parts
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Ahh, not to worry, then.
what is the chisel methodology for those? I want to replicate something like it for my prototypes im working on
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I was trying to answer this, since I’m pretty sure I know how to do it, but I can’t figure out how to articulate it better than “well, you just stand at the top and use the precise bevel chisel to make it diagonal”, which I’m not sure is actually useful.
If I ever get done with my other projects, I want to make a chisel school on someone’s creative world.
probably helps to lay it out for me on which blocks and positions you started with, that would help a lot too