Riveting Things to One's Mast - Topping Lift

I am going to install a topping lift to my V17 and I have decided on an arrangment that requires a block to be added to the top of the mast and an additional cleat added to the bottom of the mast.

I am pretty handy but I am no metal worker. Hence, I am a bit intimidated by the prospect of drilling holes in my mast and riveting stuff to it. I wanted to run the plan by you all and see if you thought it was sound and also see if you had any advice.

I will a rivet a eyestrap to the port side of the top of the mast. A swivel block will be attached to the eyestrap. I was thinking I would use a clam cleat with a becket at the bottom of the mast to secure the toppoing lift. I would use the eyestrap that is already at the aft end of the boom to secure the business end of the lift. I was going to use some sort of shackle but am thinking that an inexpensive carabiner or quick link would do the job just as well.

Any help?

Thanks,

Rick