Sewn patchwork finished

I finished this the other day. I sew during the day if I've the time and inclination and tat during the evenings - always!! I have to tat in the evenings or I'd fall asleep in front of the tremendously boring telly!!
I'm 'brewing up' more sewing projects along these lines in the aged brain but they haven't quite formulated yet!!! Lack of time seems to be the biggest problem. Why that should be I don't know. Anyway, yet again, I digress. Here's the finished table covering.

Progress on the patchwork

I made a few very silly mistakes on this last night!! You know the sort. The ones you make when you start to 'relax' into a pattern!!
I was determined to see if the diamond and square worked together.
THEY DO! I have pressed this (yes, I found the iron!) but that was just so it looked better when scanned. It sits beautifully without any 'teasing' into shape. I don't 'rate' a design until it sits properly on it's own without 'human' intervention at the end.
So, once I've finished this round I'll have to do the triangle. Unless I feel like working out another row!!! The triangle will go on top of the square if I've got it right!

I've given up!!!

Well I've given up trying to work this out the 'proper' way and am just going back to 'Jane's' way of hit and miss!!!! This is where I've got to so far - see below!!!
I am now pretty sure that the square is fine so have started a 'church window' type of patchwork. I'm calling it that as the black outline resembles the lead around the windows in churches. This was one evening's work. Obviously I haven't pressed it yet.
The next thing I'll work is another diamond between the two squares - just to check that it really will lie well. As soon as this is done I will add the amended diamond pattern to my web pages and add the square.
I've amended the diamond with red italics to show front/back sided tatting for those who want to work this way. The more I use this notation and work like this the more I love it. Thank you Gary Houtz for pointing this out to me a few years ago at Rosemarie Peel's house.
Oh, by the way, the orange and pink are MUCH brighter than the scan shows!!!

A dilemma

I have a dilemma. I cannot work out what sort of triangle I need or want to go with the diamond and squares I already have! This might sound very silly but it's important to me at the moment!!

I think I need two - an equilateral and an isoceles one. The isoceles will work on other layouts but the equilateral will work on the one below!!!

Can anybody in tatland, or anywhere else for that matter, please advise?

Next step

I thought the square was fine but now I have tested it one more time I realise there's still more tweaking to do. It's below after the drawings. Probably just a matter of the stitch count on the SCMR's.
I started on the triangle too yesterday as a little 'light relief'!!!!! This is a lot more difficult but would probably be easier if I'd tried to work it out mathematically first.
Heck, why make life more difficult for myself by doing it that way? My mind just doesn't 'do' numbers!!!

Here are the first two (yikes, they're bad!) attempts at the triangle. The drawing above did help a lot, though.
I think today I will have to work out a possible combination of all three in a drawing to see how the triangle actually works with the other two. DO wish I could do this mathematically!!!!