Sleepfinder, if you still want advice, I can offer some as my ds1 was weaned at 13 weeks. I am not bothered by what anyone thinks about this. When he was a baby, the recommendation for weaning had just changed from 13 weeks to 16 weeks but my HV suggested I weaned him as he was not gaining sufficient weight.
I kept a record of what he ate so I can tell you he started off with baby rice for a couple of weeks, then, over the next 6 weeks, had banana, strawberries, apple, carrot, aprsnip, cauliflower, leeks, potato, orange juice (I am sure that is not recommended these days though), prunes, cheese, a variety of meat, cabbage, marrow, peaches, swede, fish, pear, broccoli, aubergine. Basically, you name it, he had it, as long as it was within the recommendations.
He is now 10 and as skinny as a rake. He has always been the healthiest of boys, and of all my children, he is my best eater.
I am not sure you should do what you are doing without the HV's advice, but if you do, I also don't think you will harm your son.