We are in the search for investors looking to seek to fund a new project. As of now we have a beautiful custom-coded script by my partner. Building a whole investment system is too much work, but it is an option for the future once our dev has more time. For now we want private investors funding bigger amounts, rather than many small amounts. Profit is calculated manually weekly.
Regarding "trust", escrow may be used. Around ~5 BTC will be left in the hot wallet, and the rest will be left with the escrower decided by investors. This will most likely how it will work for the beginning unless you are willing to trust our team without escrow.
For full details, don't hesitate to shoot me a PM. I have good plans for this site.