So, this is where I realise Bacca's stacking genius. His blocks really want to be together. But I've had a go at analysing what Crab and Rabid said and Bacca's edit (including the making of the pips small enough not to cause z alignment nightmares) and have attempted to find the middle ground while retaining my 'style'/initial post. This is what I've ended up with.

For me, I like the blocks when they sit nicely on their own (particularly the thin 1 pip block), but you really notice the shortcomings when you put them together. That and the highlight down the front of the block. The pips need better shading, too, I think.
Suggestions??
[Edit: added a clear brick as well, which will be the front windscreen of the forklift. Is there a good way to increase the feeling of material here? I read in one of the other posts that plastic/glass = high shine. Not sure yet how to generate that with a block like this...]

Hmm... seeing it here, might need to do a better outline on the clear block.
[Edit 2: latest progress. Any c or c gladly taken...]

Does anyone remember if the front of the sloped blocks were textured back in 1975, or did that happen later?