I wanted to see if short guys at the back of the tarp would help the space in the half pyramid- turns out it helps with tautness and protection as well. I've always tried to pitch things as close to the ground as possible, but the bivvy should help with wind proofing and I'll look for more sheltered spots anyway. The two sides seem to give more protection at the front and there's more depth for sitting.
The next thing I had a go with was a micro tarp I made a few years back. It was when I had strarted trying to reduce weight and had read Ron Turnbull's Book of the Bivvy. The trouble was, I was going from a full two person tent and it was a jump too far for me at the time. I had an army surplus bivvy that weighed over a kilogram and when I saw the Gelert solo tent in a sale, I swapped immediately- the weight was pretty similar. Steph's cousin is in the (un?) fortunate position of having to replace all his camping gear from scratch. Interestingly he's at about the same point as I was when I started to lighten up- all his old gear was a mixture of budget stuff and gear bought for other purposes (massive skiing down jacket etc). That equals serious weight. He's expressed an interest in a tarp and bivvy combo and I have an Alpkit Hunka I didn't really need any more. The tarp is PU coated nylon with paracord guy loops and line but it still only weighs 160g. Pitching with only four pegs, it gives an overall weight of about 600g which is pretty good. Ironically, now I've said he can have this stuff, I've set it up and it looks pretty inviting. I'm also passing on a Golite Dawn and he's thinking about getting a Rab Photon jacket. I've never preached to him about weight, but he's hefted my bag a few times on different trips. It'll be interesting to see the path he travels as he buys his stuff. I'll do an update on his gear on the next trip we go on.