You are right, it really is not easy trying to fundraise especially if this is the first time an attempt was made but I hope it will be bring some benefit to the recipient. Thank you for your questions and comments. I am answering your points below:

1- I will offer the guarantee. You are right collateral will not be provided for this fundraiser

2- Yes I can sign a message with sufficient funds which would protect any lender from losses

3- The loan amounts mentioned were not slots, they were examples. I am not looking to have more than one lender because the repayment terms will be fixed at $100 per week. An ideal scenario would be for one lender being kind enough to offer an interest-free loan of at least $400 which will be paid back at $100 a week over a 4 week period. $400 will go a long way to contribute towards covering their expenses

4- There is one donation receiving address (bc1q6987cgd9s30y3hnrnrqg8vwlfvlll3mefujzal), any payments received will be up for all to see on the blockchain, however if a lender loans for example $400 then this thread could be used to show weekly transaction details when payments are sent/received likewise all donations received could be listed here for all to see too.