While large-scale language models (LLMs) have made significant progress in natural language to SQL (NL2SQL) translation, their reliance on closed systems and high computational resources poses challenges for data privacy and distribution. Small-scale language models (SLMs), on the other hand, struggle with NL2SQL tasks due to poor performance and incompatibility with existing frameworks. In this paper, we present Feather-SQL, a lightweight framework tailored for SLM. Feather-SQL improves SQL executable feasibility and accuracy through 1) schema pruning and concatenation, and 2) multi-path and multi-candidate generation. Furthermore, we propose a 1+1 model collaboration paradigm that pairs a powerful general-purpose chat model with a fine-tuned SQL expert, combining powerful analytic inference with high-precision SQL generation. BIRD experiments demonstrate that Feather-SQL improves the NL2SQL performance of SLM by approximately 10% without any fine-tuning. The proposed paradigm demonstrates its effectiveness by increasing the accuracy bound of SLM by 54.76%.