A circular saw with a saw track is a good proxy for a table saw. A decent mitre saw might be in order for your framing cutting needs.
Do It Yourself
Make it, Fix it, Renovate it, Rehabilitate it - as long as you’ve done some part of it yourself, share!
Especially for gardening related or specific do-it-yourself projects, see also the Nature and Gardening community. For more creative-minded projects, see also the Creative community.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Circular saw can do what you need.
A length of angle iron(you could use a straight piece of wood) clamped to the piece you are cutting can do the long straight cuts.
If you can fit a 4x8 of foam insulation, you can cut on top of that and the foam will last a while before it needs replacement so long as you don't go cutting all the way through it like a dummy.
(Battery powered) hand held circular saw?