Customize My Order Form

I’d like to customize my order form closer to Sam Cart layout. I’m running into 2 problems:

1st I don’t see how I can implement the HTML like theirs without access to a deeper level of the HTML which I know is protected

2nd Pay for Spiffy and I just got a few addons in Infusionsoft and I really don’t want to do that if I can reasonably do it myself if I know how to get access.

Here’s a screenshot juxtaposing what I mean:

My form has a table that when it goes into mobile looks horrible. Also, the buy with Paypal button is prominent whereas the default I have looks terrible and small.

Any ideas and a big thanks in advance.