Hi there,
This is Ahmed El Teheiwey, a Structural Engineer with 3+ years of professional experience, and with a number of completed Concrete, Steel, Timber, Post-Tension projects in UK, USA, Kenya, and Egypt.
I shall provide you with your Structural needs of Calculations for your House Remodeling, and what exact RSJ that can withstand these loads safely to knock down your wall, and I'll be glad to be of help in any other Structural-related inquiry.
My portfolio has samples of previous projects completed on my PPH account (People Per Hour Freelancing Platform).
Note: Work ethics obligates me to inform you that the budget you have set for this project is a bit too generous, and that I complete this kind of Structural Calculations for only £100 (Excluding Freelancer Fees), that'll be a total of about £115.
Looking forward to doing business with you.